Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Sales $ 76,750 $ 67,671 $ 67,530 $ 69,197 $ 68,351 $ 64,935 $ 211,951 $ 202,483  
Financial Liabilities, Long-term debt                  
Carrying Value 118,145           118,145   139,145
Fair Value 132,027           132,027   153,755
Cost of Goods Sold   35,032 34,191 35,506 36,400 32,946      
Gross Profit 34,951 32,639 33,339 33,691 31,951 31,989 100,929 97,631  
Gross profit as a percentage of revenue   48.20% 49.40% 48.70% 46.70% 49.30%      
Thermon Holding Corp.
                 
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Sales 76,750 67,671 67,530 69,197 68,351 64,935 211,951 202,483  
Financial Liabilities, Long-term debt                  
Carrying Value 118,145           118,145   139,145
Fair Value 132,027           132,027   153,755
Cost of Goods Sold   35,032 34,191 35,506 36,400 32,946      
Gross Profit $ 34,951 $ 32,639 $ 33,339 $ 33,691 $ 31,951 $ 31,989 $ 100,929 $ 97,631  
Gross profit as a percentage of revenue   48.20% 49.40% 48.70% 46.70% 49.30%