Annual report pursuant to Section 13 and 15(d)

Acquisitions - Finite-Lived Intangible Assets Acquired (Details)

v3.19.2
Acquisitions - Finite-Lived Intangible Assets Acquired (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Business Acquisition [Line Items]    
Amortization period 10 years 7 months 6 days  
Thermon Heating Systems Inc.    
Business Acquisition [Line Items]    
Gross Carrying Amount $ 76,223 $ 78,996
Accumulated Amortization 12,846 4,311
Net Carrying Amount $ 63,377 74,685
Products | Thermon Heating Systems Inc.    
Business Acquisition [Line Items]    
Amortization period 10 years  
Gross Carrying Amount $ 62,343 64,611
Accumulated Amortization 8,832 2,692
Net Carrying Amount $ 53,511 61,919
Customer relationships | Thermon Heating Systems Inc.    
Business Acquisition [Line Items]    
Amortization period 17 years  
Gross Carrying Amount $ 10,763 11,155
Accumulated Amortization 897 273
Net Carrying Amount $ 9,866 10,882
Backlog | Thermon Heating Systems Inc.    
Business Acquisition [Line Items]    
Amortization period 1 year  
Gross Carrying Amount $ 3,117 3,230
Accumulated Amortization 3,117 1,346
Net Carrying Amount $ 0 $ 1,884