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Summary of Final Fair Value Assigned to Net Assets Acquired (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 05, 2015
Jul. 31, 2015
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Business Acquisition [Line Items]          
Goodwill   $ 312,622 $ 377,693 $ 377,693 $ 312,622
Total cash consideration for acquisition, less cash acquired     $ 5,039 $ 557,651 194,486
Cruiser RV, LLC and DRV, LLC          
Business Acquisition [Line Items]          
Cash $ 1,062 1,062     $ 1,062
Other current assets 22,175        
Property, plant and equipment 4,533        
Goodwill 13,172        
Current liabilities (12,507)        
Total fair value of net assets acquired 48,585        
Less cash acquired (1,062)        
Total cash consideration for acquisition, less cash acquired 47,523 $ 47,523      
Cruiser RV, LLC and DRV, LLC | Dealer Networks          
Business Acquisition [Line Items]          
Business acquisition allocated to amortizing intangible asset 14,300        
Cruiser RV, LLC and DRV, LLC | Trademarks          
Business Acquisition [Line Items]          
Business acquisition allocated to amortizing intangible asset 5,400        
Cruiser RV, LLC and DRV, LLC | Backlog          
Business Acquisition [Line Items]          
Business acquisition allocated to amortizing intangible asset $ 450