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Summary of Final Fair Value Assigned to Net Assets Acquired (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jan. 31, 2017
Jan. 31, 2018
Jul. 31, 2017
Business Acquisition [Line Items]        
Goodwill     $ 377,693 $ 377,693
Total cash consideration for acquisition, less cash acquired   $ 5,039    
Jayco, Corp.        
Business Acquisition [Line Items]        
Cash $ 18,409      
Other current assets 258,158      
Property, plant and equipment 80,824      
Goodwill 74,184      
Current liabilities (216,776)      
Total fair value of net assets acquired 581,099      
Less cash acquired (18,409)      
Total cash consideration for acquisition, less cash acquired 562,690      
Jayco, Corp. | Trademarks        
Business Acquisition [Line Items]        
Business acquisition allocated to amortizing intangible asset 92,800      
Jayco, Corp. | Backlog        
Business Acquisition [Line Items]        
Business acquisition allocated to amortizing intangible asset 12,400      
Jayco, Corp. | Dealer Network        
Business Acquisition [Line Items]        
Business acquisition allocated to amortizing intangible asset $ 261,100