Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Accounting Policy Information (Details)

v2.4.0.8
Basis of Presentation and Accounting Policy Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2012
Scenario, Previously Reported
Dec. 31, 2013
Scenario, Previously Reported
Dec. 31, 2012
Restatement Adjustment
Dec. 31, 2012
Restatement Adjustment
Apr. 30, 2010
Thermon Holding Corp.
Dec. 31, 2013
Thermon Holding Corp.
Scenario, Previously Reported
Apr. 30, 2010
Thermon Holding Corp.
Group of investors and other private equity firms
Business Acquisition [Line Items]                      
Number of other private equity firms                     2
Cost of selling controlling interest                 $ 321,500    
Business Combination, Acquirer's Disclosure, Consideration Transferred, Equity Interests                 129,252    
Business Combination, Acquirer's Disclosure, Consideration Transferred, Liabilities Incurred                 210,000    
Sales 71,465 76,830 209,848 212,369 76,750 211,321 80 1,048      
Cost of sales 35,409 41,879 107,423 111,440 41,799 110,392          
Gross profit $ 36,056 $ 34,951 $ 102,425 $ 100,929 $ 34,951 $ 100,929          
Gross profit as a percentage of revenue   45.50%   47.50% 45.50%         47.80%