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Revenue Recognition - Schedule of Disaggregates of Revenue (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Disaggregation of Revenue [Line Items]        
Net sales $ 2,506,583 $ 2,251,570 $ 5,553,135 $ 6,454,798
Recreation Vehicles [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 2,464,002 2,206,673 5,427,357 6,324,812
Operating Segments | Recreation Vehicles [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 2,464,002 2,206,673 5,427,357 6,324,812
Operating Segments | North America [Member] | Recreation Vehicles [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 1,696,493 2,206,673 4,659,848 6,324,812
Operating Segments | Europe [Member] | Recreation Vehicles [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 767,509 767,509
Operating Segments | Travel Trailers And Other Towables | North America [Member] | Recreation Vehicles [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 734,028 978,906 2,031,291 2,801,828
Operating Segments | Fifth Wheels Towables | North America [Member] | Recreation Vehicles [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 503,227 629,308 1,366,626 1,798,005
Operating Segments | Towables | North America [Member] | Recreation Vehicles [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 1,237,255 1,608,214 3,397,917 4,599,833
Operating Segments | Class A Motorized | North America [Member] | Recreation Vehicles [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 201,927 273,095 602,689 782,610
Operating Segments | Class C Motorized | North America [Member] | Recreation Vehicles [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 242,912 301,303 609,798 866,822
Operating Segments | Class B Motorized | North America [Member] | Recreation Vehicles [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 14,399 24,061 49,444 75,547
Operating Segments | Motorized | Recreation Vehicles [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 459,238 598,459 1,261,931 1,724,979
Operating Segments | Motorized | North America [Member] | Recreation Vehicles [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 459,238 598,459 1,261,931 1,724,979
Operating Segments | Motorcaravan | Europe [Member] | Recreation Vehicles [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 506,964 506,964
Operating Segments | Campervan | Europe [Member] | Recreation Vehicles [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 94,226 94,226
Operating Segments | Caravan | Europe [Member] | Recreation Vehicles [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 100,741 100,741
Operating Segments | Other RV Related | Europe [Member] | Recreation Vehicles [Member]        
Disaggregation of Revenue [Line Items]        
Net sales 65,578   65,578  
Corporate and Eliminations        
Disaggregation of Revenue [Line Items]        
Net sales 69,506 82,239 198,468 233,171
Intercompany Eliminations        
Disaggregation of Revenue [Line Items]        
Net sales $ (26,925) $ (37,342) $ (72,690) $ (103,185)