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Long-Term Debt (Details) (USD $)
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1 Months Ended | 11 Months Ended | 12 Months Ended | 3 Months Ended | 0 Months Ended | 0 Months Ended | |||||||||
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Apr. 30, 2010
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Mar. 31, 2011
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Mar. 31, 2013
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Mar. 31, 2012
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Mar. 31, 2013
9.500% Senior Secured Notes, due May 2017 [Member]
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Mar. 31, 2012
9.500% Senior Secured Notes, due May 2017 [Member]
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Dec. 31, 2012
Revolving Credit Facility [Member]
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Mar. 31, 2013
Revolving Credit Facility [Member]
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Mar. 31, 2013
Revolving Credit Facility [Member]
Thermon Industries, Inc. [Member]
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Mar. 31, 2013
Revolving Credit Facility [Member]
Canadian subsidiary [Member]
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May 20, 2013
Subsequent Event [Member]
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Apr. 19, 2013
Subsequent Event [Member]
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Apr. 19, 2013
Subsequent Event [Member]
9.500% Senior Secured Notes, due May 2017 [Member]
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Apr. 19, 2013
Subsequent Event [Member]
Revolving Credit Facility [Member]
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Apr. 18, 2013
Subsequent Event [Member]
Revolving Credit Facility [Member]
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| Debt Instrument [Line Items] | |||||||||||||||
| Debt instrument, term | 5 years | ||||||||||||||
| Interest rate (as a percent) | 9.50% | 9.50% | |||||||||||||
| Long-term debt | $ 118,145,000 | $ 139,145,000 | $ 118,145,000 | ||||||||||||
| Less current portion | 0 | (21,000,000) | |||||||||||||
| Long-term debt, noncurrent | 118,145,000 | 118,145,000 | |||||||||||||
| Maximum borrowing capacity | 40,000,000 | 20,000,000 | 60,000,000 | 40,000,000 | |||||||||||
| Capacity available under credit facility | 37,420,000 | ||||||||||||||
| Interest rate at period end (as a percent) | 3.00% | ||||||||||||||
| Annual commitment fee on unutilized commitments (as a percent) | 0.40% | ||||||||||||||
| Cash interest expense | 11,224,000 | ||||||||||||||
| Partial redemptions | 21,000,000 | 70,855,000 | |||||||||||||
| Cash premiums paid on redemption | 630,000 | 3,825,000 | |||||||||||||
| Deferred debt amortization | 2,586,000 | 3,948,000 | 3,321,000 | 4,127,000 | 871,000 | 3,096,000 | 1,447,000 | ||||||||
| Face amount of term loan | $ 135,000,000 | $ 135,000,000 | |||||||||||||
| Foreign Currency Transaction Risk | |||||||||||||||
| Maximum term of forward contracts | 30 days | ||||||||||||||