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Income Taxes - Deferred Income Tax Assets and Liabilities (Details) (USD $)
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12 Months Ended | ||
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Mar. 31, 2015
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Mar. 31, 2014
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Mar. 31, 2013
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| Components of Deferred Tax Assets [Abstract] | |||
| Accrued liabilities and reserves | $ 2,877,000thr_DeferredTaxAssetsTaxDeferredExpenseReservesandAccrualsCurrent | $ 1,655,000thr_DeferredTaxAssetsTaxDeferredExpenseReservesandAccrualsCurrent | |
| Net operating loss carry-forward | 195,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 0us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | |
| Unrealized gain on hedge | 8,000thr_DeferredTaxAssetsHedgingTransactionsCurrent | 39,000thr_DeferredTaxAssetsHedgingTransactionsCurrent | |
| Inventories | 519,000thr_DeferredTaxAssetsInventoryCurrent | 399,000thr_DeferredTaxAssetsInventoryCurrent | |
| Total current deferred tax assets | 3,599,000us-gaap_DeferredTaxAssetsGrossCurrent | 2,093,000us-gaap_DeferredTaxAssetsGrossCurrent | |
| Foreign tax credit carry forward | 57,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | 1,722,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | |
| Capitalized transaction costs | 601,000thr_DeferredTaxAssetsCapitalizedTransactionsCostsNoncurrent | 670,000thr_DeferredTaxAssetsCapitalizedTransactionsCostsNoncurrent | |
| Net operating loss carry-forward | 488,000thr_DeferredTaxAssetsOperatingLossCarryforwardsNoncurrent | 872,000thr_DeferredTaxAssetsOperatingLossCarryforwardsNoncurrent | |
| Valuation allowance | (48,000)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent | (872,000)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent | |
| Stock option compensation | 831,000thr_DeferredTaxAssetsTaxDeferredExpensesCompensationAndBenefitsShareBasedCompensationCostsNoncurrent | 796,000thr_DeferredTaxAssetsTaxDeferredExpensesCompensationAndBenefitsShareBasedCompensationCostsNoncurrent | |
| Interest rate swap included in Other Comprehensive Loss | 261,000thr_DeferredTaxAssetsInterestRateSwapsincludedinOtherComprehensiveIncome | 0thr_DeferredTaxAssetsInterestRateSwapsincludedinOtherComprehensiveIncome | |
| Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation | 425,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation | 279,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation | |
| Other | 91,000thr_DeferredTaxAssetsOtherNoncurrent | 133,000thr_DeferredTaxAssetsOtherNoncurrent | |
| Total non-current deferred tax assets | 2,706,000us-gaap_DeferredTaxAssetsGrossNoncurrent | 3,600,000us-gaap_DeferredTaxAssetsGrossNoncurrent | |
| Components of Deferred Tax Liabilities [Abstract] | |||
| Prepaid expenses | (50,000)thr_DeferredTaxLiabilitiesPrepaidExpensesCurrent | (47,000)thr_DeferredTaxLiabilitiesPrepaidExpensesCurrent | |
| Total current deferred tax liabilities | (50,000)us-gaap_DeferredTaxLiabilitiesGrossCurrent | (47,000)us-gaap_DeferredTaxLiabilitiesGrossCurrent | |
| Intangible assets | (30,444,000)thr_DeferredTaxLiabilitiesIntangibleAssetsNoncurrent | (35,088,000)thr_DeferredTaxLiabilitiesIntangibleAssetsNoncurrent | |
| Property, plant and equipment | (2,976,000)thr_DeferredTaxLiabilitiesPropertyPlantAndEquipmentNoncurrent | (2,988,000)thr_DeferredTaxLiabilitiesPropertyPlantAndEquipmentNoncurrent | |
| Undistributed foreign earnings | (121,000)thr_DeferredTaxLiabilitiesUndistributedForeignEarningsNoncurrent | (3,141,000)thr_DeferredTaxLiabilitiesUndistributedForeignEarningsNoncurrent | |
| Total non-current tax liabilities | (33,541,000)us-gaap_DeferredTaxLiabilitiesGrossNoncurrent | (41,217,000)us-gaap_DeferredTaxLiabilitiesGrossNoncurrent | |
| Net current deferred tax asset | 3,549,000us-gaap_DeferredTaxAssetsLiabilitiesNet | 2,046,000us-gaap_DeferredTaxAssetsLiabilitiesNet | |
| Net non-current deferred tax liability | (30,835,000)us-gaap_DeferredTaxLiabilities | (37,617,000)us-gaap_DeferredTaxLiabilities | |
| Release of valuation allowance for foreign net operating loss carry forward | (634,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance |
| Undistributed earnings on foreign subsidiaries | 106,124,000us-gaap_UndistributedEarningsOfForeignSubsidiaries | ||
| Translation Adjustment Functional to Reporting Currency, Net of Tax | (525,000)us-gaap_TranslationAdjustmentFunctionalToReportingCurrencyNetOfTax | (52,000)us-gaap_TranslationAdjustmentFunctionalToReportingCurrencyNetOfTax | |
| GERMANY | |||
| Components of Deferred Tax Liabilities [Abstract] | |||
| Deferred Tax Assets, Operating Loss Carryforwards, Foreign |
2,142,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign / thr_CountryAxis = country_DE |
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| Minimum [Member] | |||
| Components of Deferred Tax Liabilities [Abstract] | |||
| Deferred tax liability not recognized, amount of unrecognized deferred tax liability, undistributed earnings of foreign subsidiaries |
8,000,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries / us-gaap_RangeAxis = us-gaap_MinimumMember |
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| Maximum [Member] | |||
| Components of Deferred Tax Liabilities [Abstract] | |||
| Deferred tax liability not recognized, amount of unrecognized deferred tax liability, undistributed earnings of foreign subsidiaries |
$ 10,000,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries / us-gaap_RangeAxis = us-gaap_MaximumMember |
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- Definition
Deferred Tax Assets, Capitalized Transactions Costs, Noncurrent No definition available.
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Current amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from hedging transactions. No definition available.
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Deferred Tax Assets, Interest Rate Swaps included in Other Comprehensive Income No definition available.
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Current amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory. No definition available.
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Deferred Tax Assets, Operating Loss Carryforwards, Noncurrent No definition available.
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Noncurrent amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed. No definition available.
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Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Current No definition available.
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Noncurrent amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation. No definition available.
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Noncurrent amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill. No definition available.
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Current amount of deferred tax consequences attributable to taxable temporary differences derived from prepaid expenses. No definition available.
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Noncurrent amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. No definition available.
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Noncurrent amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity. No definition available.
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, before jurisdictional netting. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from employee compensation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, before jurisdictional netting. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of deferred tax liability attributable to taxable temporary differences expected to be realized or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Gross amount of noncurrent deferred tax liabilities, which result from applying the applicable tax rate to taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Cumulative translation adjustment resulting from translating foreign currency financial statements into the reporting currency. Reported in equity as part of accumulated other comprehensive income. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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