Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Foreign Exchange Contracts (Details)

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Fair Value Measurements - Foreign Exchange Contracts (Details) (Thermon Holding Corp., USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Maximum term of forward contracts     30 days    
Net Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments $ (784) $ (253) $ (769) $ (236)  
Foreign Exchange Forward Contracts
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Foreign exchange contract forwards, assets 74   74   35
Foreign exchange contract forwards, liabilities 300   300   93
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net $ (208) $ (372) $ (175) $ (206)