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

Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 197,978
Goodwill, end of period	213,038	$ 197,978
Operating Segments
Goodwill [Roll Forward]
Goodwill, beginning of period	197,978	204,995
Foreign currency translation impact	15,060	(7,017)
Goodwill, end of period	213,038	197,978
Operating Segments \| United States Segment
Goodwill [Roll Forward]
Goodwill, beginning of period	62,725	62,725
Foreign currency translation impact	0	0
Goodwill, end of period	62,725	62,725
Operating Segments \| Canada
Goodwill [Roll Forward]
Goodwill, beginning of period	107,739	114,382
Foreign currency translation impact	13,811	(6,643)
Goodwill, end of period	121,550	107,739
Operating Segments \| Europe Segment
Goodwill [Roll Forward]
Goodwill, beginning of period	18,890	19,264
Foreign currency translation impact	1,249	(374)
Goodwill, end of period	20,139	18,890
Operating Segments \| Asia Segment
Goodwill [Roll Forward]
Goodwill, beginning of period	8,624	8,624
Foreign currency translation impact	0	0
Goodwill, end of period	$ 8,624	$ 8,624