Quarterly report pursuant to Section 13 or 15(d)

Earnings and Net Income (Loss) per Common Share (Details)

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Earnings and Net Income (Loss) per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Basic net income (loss) per common share                
Net income available to Thermon Group Holdings, Inc. $ 6,522 $ 6,913 $ 1,471 $ 9,719 $ 3,227 $ 3,042 $ 14,906 $ 15,988
Weighted-average common shares outstanding (in shares) 32,785,753     32,595,259     32,716,317 32,556,157
Basic net income (loss) per common share (in dollars per share) $ 0.20     $ 0.30     $ 0.46 $ 0.49
Diluted net income (loss) per common share                
Net income available to Thermon Group Holdings, Inc. $ 6,522 $ 6,913 $ 1,471 $ 9,719 $ 3,227 $ 3,042 $ 14,906 $ 15,988
Weighted-average common shares outstanding (in shares) 32,785,753     32,595,259     32,716,317 32,556,157
Diluted (in shares) 33,258,937     33,116,481     33,124,580 33,000,326
Diluted net income (loss) per common share (in dollars per share) $ 0.20     $ 0.29     $ 0.45 $ 0.48
Equity Option                
Diluted net income (loss) per common share                
Weighted average number of diluted shares outstanding adjustment (in shares) 163,357     202,971     161,420 215,472
Restricted Stock Units                
Diluted net income (loss) per common share                
Weighted average number of diluted shares outstanding adjustment (in shares) 309,827     318,251     246,843 228,697
Stock Compensation Plan                
Diluted net income (loss) per common share                
Antidilutive securities excluded from computation of earnings per share (in shares)             0