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Long-Term Debt (Details) (USD $)
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0 Months Ended | 6 Months Ended | 6 Months Ended | ||||||||||||
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Sep. 30, 2013
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Mar. 31, 2013
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May 20, 2013
9.500% Senior Secured Notes, due May 2017
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Sep. 30, 2013
9.500% Senior Secured Notes, due May 2017
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Mar. 31, 2013
9.500% Senior Secured Notes, due May 2017
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Sep. 30, 2013
Loans Payable [Member]
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Sep. 30, 2012
Loans Payable [Member]
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Sep. 30, 2013
Revolving credit facility
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Sep. 30, 2013
Revolving credit facility
Thermon Industries, Inc.
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Sep. 30, 2013
London Interbank Offered Rate (LIBOR) [Member]
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Sep. 30, 2013
Minimum
Base Rate [Member]
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Sep. 30, 2013
Maximum
Base Rate [Member]
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Sep. 30, 2013
Through March 31, 2016
Loans Payable [Member]
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Sep. 30, 2013
Last Two Years Of Loan
Loans Payable [Member]
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Sep. 30, 2013
Due in April 2018
Loans Payable [Member]
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| Debt Instrument [Line Items] | |||||||||||||||
| Debt Instrument, Face Amount | $ 135,000,000 | ||||||||||||||
| Interest rate (as a percent) | 0.00% | 2.69% | |||||||||||||
| Long-term debt | 128,250,000 | 118,145,000 | 118,145,000 | 0 | 118,145,000 | 128,250,000 | 0 | ||||||||
| Less current portion | (13,500,000) | 0 | |||||||||||||
| Long-term debt, noncurrent | 114,750,000 | 118,145,000 | |||||||||||||
| Maximum borrowing capacity | 60,000,000 | ||||||||||||||
| Capacity available under credit facility | 57,411,000 | ||||||||||||||
| Outstanding borrowings | 0 | ||||||||||||||
| Interest rate at period end (as a percent) | 2.69% | ||||||||||||||
| Interest rate in addition to LIBOR rate | 1.00% | 0.50% | 1.00% | ||||||||||||
| Annual commitment fee on unutilized commitments (as a percent) | 0.40% | ||||||||||||||
| Debt Instrument, Fee | .00125 | ||||||||||||||
| Cash premiums paid on redemption | 15,485,000 | ||||||||||||||
| Deferred debt amortization | 4,010,000 | ||||||||||||||
| Repayments of Notes Payable | $ 1,125,000 | $ 1,688,000 | $ 54,000,000 | ||||||||||||
| Derivative, Fixed Interest Rate | 3.62% | ||||||||||||||