Quarterly report pursuant to Section 13 or 15(d)

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

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Fair Value Measurements Fair Value Measurements - Foreign Exchange Contracts by Currency (Details) (Foreign Exchange Forward Contracts, USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Mar. 31, 2013
Derivatives [Line Items]    
Notional amount $ 10,742 $ 10,125
Russian Rubles | Thermon Holding Corp.
   
Derivatives [Line Items]    
Notional amount 2,670 4,233
Euro | Thermon Holding Corp.
   
Derivatives [Line Items]    
Notional amount 4,823 2,510
Canadian Dollars | Thermon Holding Corp.
   
Derivatives [Line Items]    
Notional amount 1,793 2,134
South Korean Won | Thermon Holding Corp.
   
Derivatives [Line Items]    
Notional amount 933 919
Other | Thermon Holding Corp.
   
Derivatives [Line Items]    
Notional amount $ 523