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Long-Term Debt (Details) (USD $)
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12 Months Ended | 0 Months Ended | 12 Months Ended | 9 Months Ended | 9 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||
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Mar. 31, 2014
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Mar. 31, 2013
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Mar. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2013
Loans Payable [Member]
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May 20, 2013
Senior secured note [Member]
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Mar. 31, 2013
Senior secured note [Member]
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Dec. 31, 2013
Revolving Credit Facility [Member]
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Mar. 31, 2014
Revolving Credit Facility [Member]
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Dec. 31, 2013
Revolving Credit Facility [Member]
Thermon Industries, Inc. [Member]
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Dec. 31, 2013
Period One [Member]
Loans Payable [Member]
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Dec. 31, 2013
Period Two [Member]
Loans Payable [Member]
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Dec. 31, 2013
Period Three [Member]
Loans Payable [Member]
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Mar. 31, 2014
9.500% Senior Secured Notes, due May 2017
Senior secured note [Member]
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Mar. 31, 2013
9.500% Senior Secured Notes, due May 2017
Senior secured note [Member]
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Mar. 31, 2014
Variable Rate Term Loan, Due April 2018
Loans Payable [Member]
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Mar. 31, 2013
Variable Rate Term Loan, Due April 2018
Loans Payable [Member]
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| Debt Instrument [Line Items] | |||||||||||||||||
| Debt Instrument, Fee | .00125 | ||||||||||||||||
| Interest rate (as a percent) | 2.69% | 9.50% | |||||||||||||||
| Debt instrument, maturity date | May 31, 2017 | Apr. 30, 2018 | |||||||||||||||
| Long-term debt | $ 121,500,000 | $ 118,145,000 | $ 118,145,000 | $ 0 | $ 118,145,000 | $ 121,500,000 | $ 0 | ||||||||||
| Less current portion | (13,500,000) | 0 | |||||||||||||||
| Long-term debt, noncurrent | 108,000,000 | 118,145,000 | |||||||||||||||
| Maximum borrowing capacity | 60,000,000 | ||||||||||||||||
| Capacity available under credit facility | 59,137,000 | ||||||||||||||||
| Outstanding borrowings | 0 | ||||||||||||||||
| Interest rate at period end (as a percent) | 2.69% | ||||||||||||||||
| Annual commitment fee on unutilized commitments (as a percent) | 0.40% | ||||||||||||||||
| Cash interest expense | 10,019,000 | 15,225,000 | 19,584,000 | ||||||||||||||
| Partial redemptions | 118,145,000 | 21,000,000 | 70,855,000 | ||||||||||||||
| Cash premiums paid on redemption | 15,485,000 | ||||||||||||||||
| Deferred debt amortization | 4,572,000 | 3,321,000 | 4,127,000 | 4,010,000 | 871,000 | ||||||||||||
| Face amount of term loan | 135,000,000 | ||||||||||||||||
| Foreign Currency Transaction Risk | |||||||||||||||||
| Maximum term of forward contracts | 30 days | ||||||||||||||||
| Repayments of Notes Payable | $ 21,000,000 | $ 1,125,000 | $ 1,688,000 | $ 54,000,000 | |||||||||||||
| Derivative, Fixed Interest Rate | 3.62% | ||||||||||||||||