Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Narrative (Details)

v3.10.0.1
Acquisitions - Narrative (Details)
$ in Thousands
3 Months Ended
Oct. 30, 2017
CAD ($)
Oct. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Business Acquisition [Line Items]      
Weighted average useful life     10 years 7 months 6 days
Goodwill, working capital adjustment related to acquisition     $ 481
Thermon Heating Systems Inc.      
Business Acquisition [Line Items]      
Equity interests acquired 100.00% 100.00%  
Payments to acquire business $ 262,415 $ 204,596,000 204,596,000
Transaction costs     4,093,000
Operating Segments      
Business Acquisition [Line Items]      
Goodwill, working capital adjustment related to acquisition     481,000
Operating Segments | Canada      
Business Acquisition [Line Items]      
Goodwill, working capital adjustment related to acquisition     481,000
Operating Segments | Canada | Thermon Heating Systems Inc.      
Business Acquisition [Line Items]      
Goodwill acquired     $ 85,637,000