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Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 8,328,909 | $ 7,246,952 | $ 4,582,112
Income (loss) from continuing operations before income taxes | 633,029 | 556,386 | 383,313
Operating Segments | Recreational vehicles |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 8,155,015 | 7,098,957 | 4,432,909
Income (loss) from continuing operations before income taxes | 667,442 | 584,238 | 410,397
Operating Segments | Recreational vehicles | Towables |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 6,008,700 | 5,127,491 | 3,338,659
Income (loss) from continuing operations before income taxes | 532,657 | 458,915 | 321,874
Operating Segments | Recreational vehicles | Motorized |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 2,146,315 | 1,971,466 | 1,094,250
Income (loss) from continuing operations before income taxes | 134,785 | 125,323 | 88,523
Corporate and Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 305,947 | 253,557 | 218,673
Income (loss) from continuing operations before income taxes | 32,973 | 28,909 | 18,547
Intercompany Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | (132,053) | (105,562) | (69,470)
Income (loss) from continuing operations before income taxes | (306) | (195) | (23)
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Income (loss) from continuing operations before income taxes | $ (67,080) | $ (56,566) | $ (45,608)

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