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Summary of Fair Value Assigned to Net Assets Acquired (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 05, 2015
Jul. 31, 2015
Apr. 30, 2015
Apr. 30, 2016
Business Acquisition [Line Items]        
Goodwill   $ 312,622   $ 303,509
Total cash consideration for acquisition, less cash acquired     $ 49,265  
Cruiser RV, LLC and DRV, LLC        
Business Acquisition [Line Items]        
Cash $ 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