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Long-Term Debt (Details) (USD $)
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3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | |||||||||||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2012
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Dec. 31, 2011
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Mar. 31, 2012
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Dec. 31, 2012
Thermon Holding Corp.
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Dec. 31, 2011
Thermon Holding Corp.
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Dec. 31, 2012
Thermon Holding Corp.
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Dec. 31, 2011
Thermon Holding Corp.
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Mar. 31, 2012
Thermon Holding Corp.
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Dec. 31, 2012
9.500% Senior Secured Notes, due May 2017
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Dec. 31, 2011
9.500% Senior Secured Notes, due May 2017
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Dec. 31, 2012
9.500% Senior Secured Notes, due May 2017
Thermon Holding Corp.
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Dec. 31, 2011
9.500% Senior Secured Notes, due May 2017
Thermon Holding Corp.
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Mar. 31, 2013
9.500% Senior Secured Notes, due May 2017
Thermon Holding Corp.
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Dec. 31, 2012
Revolving credit facility
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Dec. 31, 2012
Revolving credit facility
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Dec. 31, 2012
Revolving credit facility
Thermon Holding Corp.
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Dec. 31, 2012
Revolving credit facility
Thermon Holding Corp.
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Dec. 31, 2012
Revolving credit facility
Thermon Industries, Inc.
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Dec. 31, 2012
Revolving credit facility
Canadian subsidiary
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| Debt Instrument [Line Items] | |||||||||||||||||||||
| Interest rate (as a percent) | 9.50% | 9.50% | |||||||||||||||||||
| Long-term debt | $ 118,145,000 | $ 118,145,000 | $ 139,145,000 | $ 118,145,000 | $ 118,145,000 | $ 139,145,000 | $ 118,145,000 | $ 118,000,000 | |||||||||||||
| Less current portion | 0 | 0 | (21,000,000) | 0 | 0 | (21,000,000) | |||||||||||||||
| Long-term debt, noncurrent | 118,145,000 | 118,145,000 | 118,145,000 | 118,145,000 | 118,145,000 | 118,145,000 | |||||||||||||||
| Maximum borrowing capacity | 40,000,000 | 20,000,000 | |||||||||||||||||||
| Borrowing base as a percentage of eligible accounts receivable | 85.00% | 85.00% | |||||||||||||||||||
| Borrowing base as a percentage of eligible inventory | 65.00% | 65.00% | |||||||||||||||||||
| Borrowing base as a percentage of net orderly liquidation value of eligible equipment | 85.00% | 85.00% | |||||||||||||||||||
| Borrowing base as a percentage of fair market value of eligible owned real property | 80.00% | 80.00% | |||||||||||||||||||
| Capacity available under credit facility | 37,420,000 | 37,420,000 | 37,420,000 | 37,420,000 | |||||||||||||||||
| Outstanding borrowings | 0 | 0 | |||||||||||||||||||
| Interest rate at period end (as a percent) | 3.00% | 3.00% | 3.00% | 3.00% | |||||||||||||||||
| Interest rate in addition to LIBOR rate | 2.50% | 2.50% | 2.50% | 2.50% | |||||||||||||||||
| Annual commitment fee on unutilized commitments (as a percent) | 0.40% | 0.40% | |||||||||||||||||||
| Cash interest expense | 3,116,000 | 4,203,000 | 12,176,000 | 16,023,000 | 3,116,000 | 4,203,000 | 12,176,000 | 16,023,000 | 11,224,000 | 11,000,000 | |||||||||||
| Partial redemptions | 21,000,000 | 70,855,000 | 21,000,000 | 70,855,000 | 21,000,000 | 70,855,000 | 21,000,000 | 70,855,000 | |||||||||||||
| Cash premiums paid on redemption | 630,000 | 3,825,000 | 630,000 | 3,825,000 | 630,000 | 3,825,000 | |||||||||||||||
| Deferred debt amortization | $ 871,000 | $ 3,096,000 | $ 3,096,000 | $ 1,447,000 | $ 1,447,000 | ||||||||||||||||
| Foreign Currency Transaction Risk | |||||||||||||||||||||
| Maximum term of forward contracts | 90 days | ||||||||||||||||||||