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, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
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	$ 1,000	$ 0	$ 1,654,000
Options outstanding (in shares)	411,939.000	433,726.000	465,042	558,466
$5.20 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (in shares)		273,221
Options outstanding, weighted average contractual life (in years)		3 years 6 months 18 days
Options outstanding, weighted average exercise price (in dollars per share)		$ 5.20
Options outstanding, aggregate intrinsic value		$ 4,273,176
Options vested and exercisable, number exercisable (in shares)		273,221
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term		3 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		$ 4,273,176
$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)		3 years 10 months 28 days
Options outstanding, weighted average exercise price (in dollars per share)		$ 9.82
Options outstanding, aggregate intrinsic value		$ 146,996
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		3 years 10 months 27 days
Options vested and exercisable, weighted average exercise price (in dollars per share)		9.82
Options vested and exercisable, aggregate intrinsic value		$ 146,996
$12.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (in shares)		54,100
Options outstanding, weighted average contractual life (in years)		4 years 1 month 2 days
Options outstanding, weighted average exercise price (in dollars per share)		$ 12.00
Options outstanding, aggregate intrinsic value		$ 477,619
Options vested and exercisable, number exercisable (in shares)		54,100
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term		4 years 1 month 2 days
Options vested and exercisable, weighted average exercise price (in dollars per share)		12.00
Options vested and exercisable, aggregate intrinsic value		$ 477,619
$19.64
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (in shares)		28,499
Options outstanding, weighted average contractual life (in years)		9 years 9 months 4 days
Options outstanding, weighted average exercise price (in dollars per share)		$ 19.64
Options outstanding, aggregate intrinsic value		$ 34,199
Options vested and exercisable, number exercisable (in shares)		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term		9 years 9 months 3 days
Options vested and exercisable, weighted average exercise price (in dollars per share)		19.64
Options vested and exercisable, aggregate intrinsic value		$ 0
$21.52 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (in shares)		42,780
Options outstanding, weighted average contractual life (in years)		5 years 4 months 2 days
Options outstanding, weighted average exercise price (in dollars per share)		$ 21.52
Options outstanding, aggregate intrinsic value		$ (28,820)
Options vested and exercisable, number exercisable (in shares)		33,450
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term		5 years 4 months 2 days
Options vested and exercisable, weighted average exercise price (in dollars per share)		21.52
Options vested and exercisable, aggregate intrinsic value		$ (22,530)
$5.20 - $21.52 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (in shares)		411,939
Options outstanding, weighted average contractual life (in years)		4 years 3 months
Options outstanding, weighted average exercise price (in dollars per share)		$ 8.94
Options outstanding, aggregate intrinsic value		$ 4,903,170
Options vested and exercisable, number exercisable (in shares)		374,110
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term		4 years 3 months
Options vested and exercisable, weighted average exercise price (in dollars per share)		7.81
Options vested and exercisable, aggregate intrinsic value		$ 4,875,261