Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Finite-Lived Intangible Assets Acquired (Details)

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Acquisitions - Finite-Lived Intangible Assets Acquired (Details) - Thermon Heating Systems Inc. - USD ($)
$ in Thousands
Oct. 30, 2017
Sep. 30, 2018
Mar. 31, 2018
Business Acquisition [Line Items]      
Gross Carrying Amount   $ 78,684 $ 78,996
Accumulated Amortization   9,447 4,311
Net Carrying Amount   69,237 74,685
Products      
Business Acquisition [Line Items]      
Amortization period 10 years    
Gross Carrying Amount   64,356 64,611
Accumulated Amortization   5,899 2,692
Net Carrying Amount   58,457 61,919
Customer relationships      
Business Acquisition [Line Items]      
Amortization period 17 years    
Gross Carrying Amount   11,111 11,155
Accumulated Amortization   599 273
Net Carrying Amount   10,512 10,882
Backlog      
Business Acquisition [Line Items]      
Amortization period 1 year    
Gross Carrying Amount   3,217 3,230
Accumulated Amortization   2,949 1,346
Net Carrying Amount   $ 268 $ 1,884