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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)

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