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

Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Expense - Restricted Shares (Details)

Stock-Based Compensation Expense - Restricted Shares (Details) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	18,000	21,000	16,000
Granted (in shares)	0	17,000	13,000
Exercised (in shares)	(18,000)	(21,000)	(8,000)
Forfeited (in shares)	0	0	0
Outstanding, end of period (in shares)	0	18,000	21,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Options outstanding, weighted average grant price, beginning of period (in dollars per share)	$ 20.09	$ 18.09	$ 12.42
Granted, weighted average exercise price (in dollars per share)	$ 0.00	$ 20.09	$ 21.52
Exercised, weighted average exercise price (in dollars per share)	$ 20.09	$ 18.09	$ 12.42
Forfeited, weighted average exercise price (in dollars per share)	$ 0.00	$ 0.00	$ 0.00
Options outstanding, weighted average grant price, end of period (in dollars per share)	$ 0.00	$ 20.09	$ 18.09
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value	$ 4,786,000
Total unrecognized expense related to non-vested stock option awards	3,032,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	164,325	71,109	0
Granted (in shares)	96,462	117,904	71,923
Exercised (in shares)	(46,623)	(18,786)
Forfeited (in shares)	(15,342)	(5,902)	(814)
Outstanding, end of period (in shares)	198,822	164,325	71,109
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Options outstanding, weighted average grant price, beginning of period (in dollars per share)	$ 20.53	$ 21.52	$ 0
Granted, weighted average exercise price (in dollars per share)	$ 24.44	$ 20.14	$ 21.52
Exercised, weighted average exercise price (in dollars per share)	$ 20.67	$ 21.52
Forfeited, weighted average exercise price (in dollars per share)	$ 20.76	$ 21.52	$ 21.52
Options outstanding, weighted average grant price, end of period (in dollars per share)	$ 22.38	$ 20.53	$ 21.52
Stock based compensation, recognition period	1 year 9 months 8 days
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period, Value	1,187,000	480,000	960,000
Total unrecognized expense related to non-vested stock option awards	$ 650,000
Vested shares	19,446	12,254
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Granted (in shares)	15,162	10,594
Forfeited (in shares)	(4,284)	(1,660)
Minimum [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement, Possible Number Of Shares Issued Each Year	0	0	0
Maximum [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement, Possible Number Of Shares Issued Each Year	93,000	58,076	29,000
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of restricted stock as deferred compensation to employees and directors	11,956
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercised (in shares)	(88,050)	(566,487)	(1,086,486)