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., Foreign Exchange Forward Contracts, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Mar. 31, 2014
Derivatives [Line Items]    
Notional amount $ 17,135 $ 8,178
Russian Rubles
   
Derivatives [Line Items]    
Notional amount 1,789 772
Euro
   
Derivatives [Line Items]    
Notional amount 1,406 2,386
Canadian Dollars
   
Derivatives [Line Items]    
Notional amount 2,224 0
South Korean Won
   
Derivatives [Line Items]    
Notional amount 4,666 532
India, Rupees
   
Derivatives [Line Items]    
Notional amount 3,078 2,574
United Kingdom, Pounds
   
Derivatives [Line Items]    
Notional amount 610 201
Mexico, Pesos
   
Derivatives [Line Items]    
Notional amount 1,392 1,077
Other
   
Derivatives [Line Items]    
Notional amount $ 1,970 $ 636