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 9 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
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 $ 117 $ 242 $ 353 $ 181  
Foreign Exchange Forward Contracts
          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Foreign exchange contract forwards, assets 2   2   87
Foreign exchange contract forwards, liabilities 16   16   32
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net $ 144 $ (425) $ 350 $ (164)