Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Accounting Policy Information (Details)

v2.4.1.9
Basis of Presentation and Accounting Policy Information (Details) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended
Apr. 30, 2010
Thermon Holding Corp.  
Business Acquisition [Line Items]  
Cost of selling controlling interest $ 321,500thr_BusinessCombinationAcquirersDisclosureConsiderationTransferred
/ us-gaap_BusinessAcquisitionAxis
= thr_ThermonHoldingCorpMember
Business Combination, Acquirer's Disclosure, Consideration Transferred, Equity Interests 129,252thr_BusinessCombinationAcquirersDisclosureConsiderationTransferredEquityInterests
/ us-gaap_BusinessAcquisitionAxis
= thr_ThermonHoldingCorpMember
Business Combination, Acquirer's Disclosure, Consideration Transferred, Liabilities Incurred $ 210,000thr_BusinessCombinationAcquirersDisclosureConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= thr_ThermonHoldingCorpMember
Thermon Holding Corp. | Group of investors and other private equity firms  
Business Acquisition [Line Items]  
Number of other private equity firms 2thr_NumberOfPrivateEquityFirms
/ thr_BusinessAcquisitionByAcquirerAxis
= thr_GroupOfInvestorsAndOtherPrivateEquityFirmsMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember