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Long-Term Debt (Details) (USD $)
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9 Months Ended |
0 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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May 20, 2013
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Jun. 11, 2014
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Jun. 10, 2014
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Mar. 31, 2014
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| Debt Instrument [Line Items] |
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| Less current portion |
$ (13,500,000)us-gaap_SecuredDebtCurrent
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$ (13,500,000)us-gaap_SecuredDebtCurrent
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| Long-term debt, noncurrent |
97,875,000us-gaap_SecuredLongTermDebt
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108,000,000us-gaap_SecuredLongTermDebt
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| Premiums paid on redemptions |
0us-gaap_RedemptionPremium
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(15,485,000)us-gaap_RedemptionPremium
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| Issuance costs associated with revolving line of credit and long term debt |
290,000us-gaap_DebtIssuanceCosts
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| 9.500% Senior Secured Notes, due May 2017 |
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| Debt Instrument [Line Items] |
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| Variable Rate Term Loan, due April 2019 |
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118,145,000us-gaap_SecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
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| Debt Instrument, interest rate, stated percentage |
2.1875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
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| Premiums paid on redemptions |
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15,485,000us-gaap_RedemptionPremium
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
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| Deferred debt amortization |
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4,010,000us-gaap_AmortizationOfDeferredCharges
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
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| Loans Payable |
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| Debt Instrument [Line Items] |
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| Variable Rate Term Loan, due April 2019 |
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121,500,000us-gaap_SecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
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| Debt Instrument, interest rate, stated percentage |
2.1875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
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| Revolving credit facility |
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| Debt Instrument [Line Items] |
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| Maximum borrowing capacity |
60,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
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| Debt instrument, interest rate, decrease (percentage) |
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0.25%us-gaap_DebtInstrumentInterestRateIncreaseDecrease
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
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| Line of credit facility, decrease in periodic payment (as a percentage) |
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0.05%thr_LineofCreditFacilityIncreaseDecreasePeriodicPaymentPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
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| Maximum leverage ratio |
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2.75thr_DebtInstrumentCovenantComplianceMaximumLeverageRatio
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
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2.25thr_DebtInstrumentCovenantComplianceMaximumLeverageRatio
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
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| Annual commitment fee on unutilized commitments (as a percent) |
0.30%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
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| Line of credit facility, commitment fee percentage |
0.125%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
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| Outstanding borrowings |
0us-gaap_LinesOfCreditCurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
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| Revolving credit facility | Thermon Industries, Inc. |
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| Debt Instrument [Line Items] |
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| Capacity available under credit facility |
59,137,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ dei_LegalEntityAxis
= thr_ThermonIndustriesIncMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
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| Interest rate at period end (as a percent) |
2.1875%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ dei_LegalEntityAxis
= thr_ThermonIndustriesIncMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
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| London Interbank Offered Rate (LIBOR) |
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| Debt Instrument [Line Items] |
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| Interest rate in addition to LIBOR rate |
1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
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| Canadian Deposit Offer Rate |
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| Debt Instrument [Line Items] |
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| Interest rate in addition to LIBOR rate |
1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_VariableRateAxis
= thr_CanadianDepositOfferRateMember
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| Minimum | Base Rate |
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| Debt Instrument [Line Items] |
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| Interest rate in addition to LIBOR rate |
0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
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| Maximum | Base Rate |
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| Debt Instrument [Line Items] |
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| Interest rate in addition to LIBOR rate |
1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
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| Through March 31, 2016 | Loans Payable |
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| Debt Instrument [Line Items] |
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| Repayments of Notes Payable |
1,125,000us-gaap_RepaymentsOfNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
/ thr_PeriodAxis
= thr_PeriodOneMember
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| Last Two Years Of Loan | Loans Payable |
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| Debt Instrument [Line Items] |
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| Repayments of Notes Payable |
1,688,000us-gaap_RepaymentsOfNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
/ thr_PeriodAxis
= thr_PeriodTwoMember
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| Due in April 2018 | Loans Payable |
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| Debt Instrument [Line Items] |
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| Repayments of Notes Payable |
$ 40,500,000us-gaap_RepaymentsOfNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
/ thr_PeriodAxis
= thr_PeriodThreeMember
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