Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Income Taxes        
Annual effective tax rate before discrete events     34.80% 38.00%
Annual effective tax rate after discrete events     35.20% 37.10%
Income tax expense $ 4,161 $ 4,074 $ 11,585 $ 3,294
Pre-tax income (loss) 11,899 11,007 32,910 9,075
Long-term liability for uncertain tax positions 1,509   1,509  
Interest and penalties accrued as income tax expense     106  
Cumulative total accrual of interest and penalties 1,615   1,615  
Thermon Holding Corp.
        
Income Taxes        
Annual effective tax rate before discrete events     34.80% 38.00%
Annual effective tax rate after discrete events     35.20% 37.10%
Income tax expense 4,161 4,074 11,585 3,294
Pre-tax income (loss) 11,899 11,007 32,910 9,075
Long-term liability for uncertain tax positions 1,509   1,509  
Interest and penalties accrued as income tax expense     106  
Cumulative total accrual of interest and penalties $ 1,615   $ 1,615