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Business Combinations - Summary of Purchase Price Allocation (Details) - USD ($)
$ in Thousands
3 Months Ended 7 Months Ended
Apr. 01, 2019
Oct. 31, 2019
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2017
Business Acquisition [Line Items]          
Goodwill   $ 362,253 $ 362,253 $ 225,290 $ 205,029
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 9,218        
(Dollars in thousands) 142,779        
Goodwill 135,521        
Other intangible assets 264,190 264,200 264,200    
Other long-term assets 7,971        
Accounts payable (36,655)        
Accrued liabilities (52,258)        
Deferred income tax liabilities (86,231)        
Other long-term liabilities (6,665)        
Total fair value of net assets acquired 701,314        
Cash and cash equivalents (16,341)        
Total purchase price $ 679,300 $ 5,700 $ 684,973