Thermon Group Holdings, Inc. Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets - Schedule of Definite-Lived Assets (Details)

Goodwill and Other Intangible Assets - Schedule of Definite-Lived Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Schedule of Acquired Indefinite-Lived and Finite-Lived Intangible Assets [Line Items]
Net carrying amount, finite-lived intangibles	$ 57,330us-gaap_FiniteLivedIntangibleAssetsNet
Net carrying amount, intangibles	100,813	118,917
CHS Transactions [Member]
Schedule of Acquired Indefinite-Lived and Finite-Lived Intangible Assets [Line Items]
Gross carrying amount, intangibles	156,685	169,403
Accumulated amortization, intangibles	(57,110)	(50,486)
Net carrying amount, intangibles	99,575	118,917
CHS Transactions [Member] \| Developed Technology Rights [Member]
Schedule of Acquired Indefinite-Lived and Finite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite-lived intangibles	9,862	10,781
Accumulated amortization, finite-lived intangibles	(2,469)	(2,167)
Net carrying amount, finite-lived intangibles	7,393	8,614
CHS Transactions [Member] \| Customer Relationships [Member]
Schedule of Acquired Indefinite-Lived and Finite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite-lived intangibles	92,581	99,578
Accumulated amortization, finite-lived intangibles	(44,195)	(37,383)
Net carrying amount, finite-lived intangibles	48,386	62,195
CHS Transactions [Member] \| Backlog [Member]
Schedule of Acquired Indefinite-Lived and Finite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite-lived intangibles	9,129	9,874
Accumulated amortization, finite-lived intangibles	(9,129)	(9,874)
Net carrying amount, finite-lived intangibles	0	0
CHS Transactions [Member] \| Other [Member]
Schedule of Acquired Indefinite-Lived and Finite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite-lived intangibles	1,630	1,630
Accumulated amortization, finite-lived intangibles	(1,317)	(1,062)
Net carrying amount, finite-lived intangibles	313	568
CHS Transactions [Member] \| Trademarks [Member]
Schedule of Acquired Indefinite-Lived and Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	43,034	47,042
CHS Transactions [Member] \| Certification Marks [Member]
Schedule of Acquired Indefinite-Lived and Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 449	$ 498