Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 7,864,758	$ 8,328,909	$ 7,246,952
Income (loss) from continuing operations before income taxes	184,666	633,029	556,386
Recreational vehicles
Segment Reporting Information [Line Items]
Net sales	7,694,758	8,155,015	7,098,957
Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Net sales	7,694,758	8,155,015	7,098,957
Income (loss) from continuing operations before income taxes	397,192	667,442	584,238
Operating Segments | Recreational vehicles | North American [Member]
Segment Reporting Information [Line Items]
Net sales	6,207,780	8,155,015	7,098,957
Income (loss) from continuing operations before income taxes	403,138	667,442	584,238
Operating Segments | Recreational vehicles | European [Member]
Segment Reporting Information [Line Items]
Net sales	1,486,978	0	0
Income (loss) from continuing operations before income taxes	(5,946)	0	0
Operating Segments | Recreational vehicles | North American Towables
Segment Reporting Information [Line Items]
Net sales	4,558,451	6,008,700	5,127,491
Income (loss) from continuing operations before income taxes	322,228	532,657	458,915
Operating Segments | Recreational vehicles | North American Motorized
Segment Reporting Information [Line Items]
Net sales	1,649,329	2,146,315	1,971,466
Income (loss) from continuing operations before income taxes	80,910	134,785	125,323
Corporate and Eliminations
Segment Reporting Information [Line Items]
Net sales	263,374	305,947	253,557
Income (loss) from continuing operations before income taxes	29,086	32,667	28,714
Intercompany Eliminations
Segment Reporting Information [Line Items]
Net sales	(93,374)	(132,053)	(105,562)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	$ (241,612)	$ (67,080)	$ (56,566)