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 - Stock Options Outstanding, Exercisable and Intrinsic Value (Details)

Stock-Based Compensation Expense - Stock Options Outstanding, Exercisable and Intrinsic Value (Details) - Stock Options [Member] - USD ($)	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 384,000	$ 1,654,000	$ 10,285,000
Options outstanding (in shares)	433,726.000	465,042.000	558,466	1,132,780
$5.20 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (in shares)	309,715
Options outstanding, weighted average contractual life (in years)	4 years 6 months 18 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 5.20
Options outstanding, aggregate intrinsic value	$ 3,828,077
Options vested and exercisable, number exercisable (in shares)	309,715
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	4 years 6 months 18 days
Options vested and exercisable, weighted average exercise price (in dollars per share)	5.20
Options vested and exercisable, aggregate intrinsic value	$ 3,828,077
$9.82 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (in shares)	13,339
Options outstanding, weighted average contractual life (in years)	4 years 10 months 28 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 9.82
Options outstanding, aggregate intrinsic value	$ 103,244
Options vested and exercisable, number exercisable (in shares)	13,339
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	4 years 10 months 28 days
Options vested and exercisable, weighted average exercise price (in dollars per share)	9.82
Options vested and exercisable, aggregate intrinsic value	$ 103,244
$12.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (in shares)	65,660
Options outstanding, weighted average contractual life (in years)	5 years 1 month 13 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 12.00
Options outstanding, aggregate intrinsic value	$ 364,445
Options vested and exercisable, number exercisable (in shares)	44,720
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	5 years 1 month 13 days
Options vested and exercisable, weighted average exercise price (in dollars per share)	12.00
Options vested and exercisable, aggregate intrinsic value	$ 248,143
$21.52 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (in shares)	45,012
Options outstanding, weighted average contractual life (in years)	6 years 4 months 3 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 21.52
Options outstanding, aggregate intrinsic value	$ (177,978)
Options vested and exercisable, number exercisable (in shares)	25,142
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	6 years 4 months 3 days
Options vested and exercisable, weighted average exercise price (in dollars per share)	21.52
Options vested and exercisable, aggregate intrinsic value	$ (99,400)
$5.20 - $21.52 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (in shares)	433,726
Options outstanding, weighted average contractual life (in years)	4 years 9 months 26 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 8.07
Options outstanding, aggregate intrinsic value	$ 4,117,788
Options vested and exercisable, number exercisable (in shares)	392,916
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	4 years 9 months 26 days
Options vested and exercisable, weighted average exercise price (in dollars per share)	7.18
Options vested and exercisable, aggregate intrinsic value	$ 4,080,064