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Business Acquisitions (Details) - USD ($)
$ in Thousands
2 Months Ended
Sep. 30, 2019
Apr. 29, 2019
Nov. 30, 2019
Aug. 31, 2019
Business Acquisition [Line Items]        
Goodwill     $ 678,391 $ 622,255
JJMD        
Business Acquisition [Line Items]        
Amount of cash paid for business acquisitions $ 106,900 $ 163,100    
Assets acquired 185,000 169,400    
Liabilities assumed 78,100 $ 6,300    
Contract assets 83,200      
Inventory 35,100      
Goodwill 55,700      
Pension obligation $ 58,800