Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Provisional Value) (Details)

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Acquisitions (Provisional Value) (Details) - USD ($)
$ in Thousands
10 Months Ended
Oct. 31, 2018
Dec. 31, 2018
Mar. 31, 2018
Final Fair Value [Abstract]      
Goodwill   $ 203,045 $ 210,566
Thermon Heating Systems Inc.      
Final Fair Value [Abstract]      
Inventories $ 20,085 20,085  
Other current assets 1,181 1,181  
Goodwill 85,637    
Current liabilities 6,832 6,832  
Non-current deferred tax liability 19,326 $ 19,326  
Provisional Fair Value      
Inventories 20,489    
Other current assets 731    
Goodwill 87,540    
Current liabilities 6,255    
Non-current deferred tax liability $ 22,121