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Business Acquisitions - Preliminary Allocation (Details) - USD ($)
$ in Thousands
Oct. 31, 2018
Jun. 01, 2018
Apr. 30, 2018
Preliminary Purchase Price Allocation      
Goodwill $ 622,732   $ 427,645
Titan      
Preliminary Purchase Price Allocation      
Cash   $ 5,573  
Trade accounts and notes receivable   84,039  
Inventories   60,272  
Prepaid and other current assets   8,334  
Property and equipment   37,263  
Goodwill   196,969  
Intangible assets   289,423  
Accounts payable and accrued expenses   (40,833)  
Contingent consideration   (12,039)  
Deferred income taxes   (14,337)  
Fair value of consideration transferred   $ 614,664