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

Annual report pursuant to Section 13 and 15(d)

Organization and Summary of Significant Accounting Policies (Details)

Organization and Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended			0 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Apr. 30, 2010
Business Acquisition [Line Items]
Cost of selling controlling interest												$ 129,252thr_CostForSaleOfControllingInterest
Sales					67,475us-gaap_SalesRevenueNet	71,465us-gaap_SalesRevenueNet	72,783us-gaap_SalesRevenueNet	65,600us-gaap_SalesRevenueNet	308,578us-gaap_SalesRevenueNet	277,323us-gaap_SalesRevenueNet	284,036us-gaap_SalesRevenueNet
Gross Profit	34,105us-gaap_GrossProfit	45,533us-gaap_GrossProfit	41,221us-gaap_GrossProfit	33,845us-gaap_GrossProfit	32,745us-gaap_GrossProfit	36,056us-gaap_GrossProfit	35,355us-gaap_GrossProfit	31,014us-gaap_GrossProfit	154,704us-gaap_GrossProfit	135,170us-gaap_GrossProfit	132,832us-gaap_GrossProfit
Net cash provided by (used in) operations									51,731	46,114	41,370
Non-U.S.									40,069	39,078	36,358
Disclosure on Geographic Areas, Long-Lived Assets in Foreign Countries	53.00%				55.00%				53.00%	55.00%
Entity Wide Disclosure On Geographic Areas, Revenue From External Customers Attributed To Foreign Countries, Percentage									63.00%	67.00%	71.00%
Movement in Valuation Allowances and Reserves [Roll Forward]
Amortization of Deferred Charges									464us-gaap_AmortizationOfDeferredCharges	4,572us-gaap_AmortizationOfDeferredCharges	3,321us-gaap_AmortizationOfDeferredCharges
Research and Development Expense									2,907us-gaap_ResearchAndDevelopmentExpense	3,008us-gaap_ResearchAndDevelopmentExpense	2,832us-gaap_ResearchAndDevelopmentExpense
Group of investors and other private equity firms [Member]
Business Acquisition [Line Items]
Number of other private equity firms												2
Land Improvements [Member] \| Minimum [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Property, Plant and Equipment, Estimated Useful Lives									15 years
Land Improvements [Member] \| Maximum [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Property, Plant and Equipment, Estimated Useful Lives									20 years
Building and Building Improvements [Member] \| Minimum [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Property, Plant and Equipment, Estimated Useful Lives									10 years
Building and Building Improvements [Member] \| Maximum [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Property, Plant and Equipment, Estimated Useful Lives									40 years
Machinery and equipment [Member] \| Minimum [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Property, Plant and Equipment, Estimated Useful Lives									3 years
Machinery and equipment [Member] \| Maximum [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Property, Plant and Equipment, Estimated Useful Lives									25 years
Furniture and Fixtures [Member] \| Minimum [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Property, Plant and Equipment, Estimated Useful Lives									3 years
Furniture and Fixtures [Member] \| Maximum [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Property, Plant and Equipment, Estimated Useful Lives									10 years
Software Development [Member] \| Minimum [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Property, Plant and Equipment, Estimated Useful Lives									5 years
Software Development [Member] \| Maximum [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Property, Plant and Equipment, Estimated Useful Lives									7 years
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, beginning of period				751				1,141	751	1,141	1,434
Reductions to expense									175
Additions charged to expense										(175)	(21)
Write-off of uncollectible accounts									(141)	(215)	(272)
Balance, end of period	785				751				785	751	1,141
Inventory Valuation Reserve [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, beginning of period				893				1,076	893	1,076	1,094
Reductions to expense									(56)	(54)	(197)
Additions charged to expense									279	(129)	179
Balance, end of period	1,116				893				1,116	893	1,076
Predecessor [Member] \| Group of investors and other private equity firms [Member] \| Thermon Holding Corp. [Member]
Business Acquisition [Line Items]
Fair value of total consideration transferred												321,500
Consideration transferred, liabilities incurred												$ 210,000