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
Dec. 31, 2018
Mar. 31, 2018
Business Acquisition [Line Items]      
Gross Carrying Amount   $ 74,664 $ 78,996
Accumulated Amortization   10,902 4,311
Net Carrying Amount   63,762 74,685
Products      
Business Acquisition [Line Items]      
Amortization period 10 years    
Gross Carrying Amount   61,068 64,611
Accumulated Amortization   7,125 2,692
Net Carrying Amount   53,943 61,919
Customer relationships      
Business Acquisition [Line Items]      
Amortization period 17 years    
Gross Carrying Amount   10,543 11,155
Accumulated Amortization   724 273
Net Carrying Amount   9,819 10,882
Backlog      
Business Acquisition [Line Items]      
Amortization period 1 year    
Gross Carrying Amount   3,053 3,230
Accumulated Amortization   3,053 1,346
Net Carrying Amount   $ 0 $ 1,884