Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Foreign Exchange Contracts by Currency (Details)

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Fair Value Measurements - Foreign Exchange Contracts by Currency (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
Derivatives [Line Items]          
Foreign Currency Transaction Gain (Loss), Net of Impact of Foreign Currency Derivatives on Earnings $ (117) $ (242) $ (353) $ (181)  
Foreign Exchange Forward Contracts
         
Derivatives [Line Items]          
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net 144 (425) 350 (164)  
Notional amount 9,655   9,655   10,125
Russian Rubles | Foreign Exchange Forward Contracts
         
Derivatives [Line Items]          
Notional amount 544   544   4,233
Euro | Foreign Exchange Forward Contracts
         
Derivatives [Line Items]          
Notional amount 7,077   7,077   2,510
Canadian Dollars | Foreign Exchange Forward Contracts
         
Derivatives [Line Items]          
Notional amount 2,034   2,034   2,134
South Korean Won | Foreign Exchange Forward Contracts
         
Derivatives [Line Items]          
Notional amount 0   0   919
Other | Foreign Exchange Forward Contracts
         
Derivatives [Line Items]          
Notional amount $ 0   $ 0   $ 329