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, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
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	$ 10,285,000	$ 18,387,000	$ 8,860,000
Options outstanding (in shares)	558,466.000	1,132,780.00	2,179,625	2,757,524
$5.20 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (in shares)	393,327
Options outstanding, weighted average contractual life (in years)	6 years 6 months 18 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 5.20
Options outstanding, aggregate intrinsic value	7,072,019
Options vested and exercisable, number exercisable (in shares)	393,327
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	6 years 6 months 17 days
Options vested and exercisable, weighted average exercise price (in dollars per share)	5.20
Options vested and exercisable, aggregate intrinsic value	7,072,019
$9.82 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (in shares)	26,821
Options outstanding, weighted average contractual life (in years)	6 years 10 months 28 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 9.82
Options outstanding, aggregate intrinsic value	358,329
Options vested and exercisable, number exercisable (in shares)	26,821
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	6 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	358,329
$12.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (in shares)	88,104
Options outstanding, weighted average contractual life (in years)	7 years 1 month 13 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 12.00
Options outstanding, aggregate intrinsic value	985,003
Options vested and exercisable, number exercisable (in shares)	24,054
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	7 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	268,924
$21.52 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (in shares)	50,214
Options outstanding, weighted average contractual life (in years)	8 years 4 months 2 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 21.52
Options outstanding, aggregate intrinsic value	83,355
Options vested and exercisable, number exercisable (in shares)	8,866
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	8 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	14,718
$5.20 - $21.52 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (in shares)	558,466
Options outstanding, weighted average contractual life (in years)	6 years 9 months 23 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 7.96
Options outstanding, aggregate intrinsic value	8,498,706
Options vested and exercisable, number exercisable (in shares)	453,068
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	6 years 7 months 22 days
Options vested and exercisable, weighted average exercise price (in dollars per share)	6.15
Options vested and exercisable, aggregate intrinsic value	$ 7,713,990