Annual report pursuant to Section 13 and 15(d)

Acquisitions - Pro Forma Information (Details)

v3.8.0.1
Acquisitions - Pro Forma Information (Details) - Thermon Heating Systems Inc. - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Business Acquisition [Line Items]    
Revenues $ 348,557 $ 331,007
Net income available to Thermon Group Holdings, Inc. (loss) $ 5,303 $ 3,318
Basic (in dollars per share) $ 0.16 $ 0.10
Diluted (in dollars per share) $ 0.16 $ 0.10