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Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Segment Reporting Information [Line Items]
Net sales	$ 2,506,583	$ 2,251,570	$ 5,553,135	$ 6,454,798
Income (loss) from continuing operations before income taxes	41,523	180,525	74,913	508,681
Recreational vehicles
Segment Reporting Information [Line Items]
Net sales	2,464,002	2,206,673	5,427,357	6,324,812
Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Net sales	2,464,002	2,206,673	5,427,357	6,324,812
Income (loss) from continuing operations before income taxes	97,953	186,761	245,480	537,464
Operating Segments | Recreational vehicles | North American [Member]
Segment Reporting Information [Line Items]
Net sales	1,696,493	2,206,673	4,659,848	6,324,812
Income (loss) from continuing operations before income taxes	128,900	186,761	276,427	537,464
Operating Segments | Recreational vehicles | European [Member]
Segment Reporting Information [Line Items]
Net sales	767,509	0	767,509	0
Income (loss) from continuing operations before income taxes	(30,947)	0	(30,947)	0
Operating Segments | Recreational vehicles | North American Towables
Segment Reporting Information [Line Items]
Net sales	1,237,255	1,608,214	3,397,917	4,599,833
Income (loss) from continuing operations before income taxes	103,715	147,853	212,325	423,432
Operating Segments | Recreational vehicles | North American Motorized
Segment Reporting Information [Line Items]
Net sales	459,238	598,459	1,261,931	1,724,979
Income (loss) from continuing operations before income taxes	25,185	38,908	64,102	114,032
Corporate and Eliminations
Segment Reporting Information [Line Items]
Net sales	69,506	82,239	198,468	233,171
Income (loss) from continuing operations before income taxes	7,868	8,872	19,728	22,645
Intercompany Eliminations
Segment Reporting Information [Line Items]
Net sales	(26,925)	(37,342)	(72,690)	(103,185)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	$ (64,298)	$ (15,108)	$ (190,295)	$ (51,428)

X

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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