Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets - Acquisition Recognized Identified Assets Acquired and Liabilities (Details)

v2.4.1.9
Goodwill and Other Intangible Assets - Acquisition Recognized Identified Assets Acquired and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Mar. 02, 2015
Assets acquired:      
Goodwill $ 105,232us-gaap_Goodwill $ 114,112us-gaap_Goodwill  
Unitemp      
Assets acquired:      
Accounts receivable     1,346us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= thr_UnitempMember
Inventories     655us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= thr_UnitempMember
Other current assets     21us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= thr_UnitempMember
Property, plant and equipment     77us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= thr_UnitempMember
Identifiable intangible assets     1,294us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= thr_UnitempMember
Goodwill     1,630us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= thr_UnitempMember
Total assets     5,023thr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAssetsIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= thr_UnitempMember
Liabilities assumed:      
Current liabilities     415us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= thr_UnitempMember
Noncurrent deferred tax liability     718us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= thr_UnitempMember
Total liabilities     1,133us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= thr_UnitempMember
Purchase price     3,890us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= thr_UnitempMember
Transaction costs     $ 34us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= thr_UnitempMember