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Business Combinations - Allocation of Preliminary Purchase Price, The Charles Machine Works (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 01, 2019
Oct. 31, 2019
Jul. 31, 2020
Aug. 02, 2019
Business Acquisition [Line Items]        
Goodwill   $ 362,253 $ 424,228 $ 380,503
The Charles Machine Works, Inc.        
Business Acquisition [Line Items]        
Cash and cash equivalents $ 16,341      
Receivables 65,674      
Inventories 241,429      
Prepaid expenses and other current assets 8,050      
Property, plant and equipment 142,779      
Goodwill 134,657      
Other intangible assets 264,190      
Other long-term assets 7,971      
Accounts payable (35,892)      
Accrued liabilities (51,943)      
Deferred income tax liabilities (85,277)      
Other long-term liabilities (6,665)      
Total fair value of net assets acquired 701,314      
Less: cash and cash equivalents acquired (16,341)      
Total CMW purchase price $ 684,973 $ 685,000