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) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2015
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 $ (161) $ 15  
Foreign Exchange Forward Contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Foreign exchange contract forwards, assets 2    
Foreign exchange contract forwards, liabilities 47    
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net $ (419) $ 33  
Thermon Holding Corp. | Foreign Exchange Forward Contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Foreign exchange contract forwards, assets     $ 87
Foreign exchange contract forwards, liabilities     $ 110