BUSINESS SEGMENTS - Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 8,167,933	$ 7,864,758	$ 8,328,909
Income (loss) from continuing operations before income taxes, noncontrolling interest	272,896	184,666	633,029
Recreational vehicles
Segment Reporting Information [Line Items]
Net sales	8,015,971	7,694,758	8,155,015
Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Net sales	8,015,971	7,694,758	8,155,015
Income (loss) from continuing operations before income taxes, noncontrolling interest	418,000	397,192	667,442
Operating Segments | Recreational vehicles | North American
Segment Reporting Information [Line Items]
Net sales	5,530,580	6,207,780	8,155,015
Income (loss) from continuing operations before income taxes, noncontrolling interest	408,150	403,138	667,442
Operating Segments | Recreational vehicles | European
Segment Reporting Information [Line Items]
Net sales	2,485,391	1,486,978	0
Income (loss) from continuing operations before income taxes, noncontrolling interest	9,850	(5,946)	0
Operating Segments | Recreational vehicles | Towables
Segment Reporting Information [Line Items]
Net sales	4,140,482	4,558,451	6,008,700
Income (loss) from continuing operations before income taxes, noncontrolling interest	336,207	322,228	532,657
Operating Segments | Recreational vehicles | North American Motorized
Segment Reporting Information [Line Items]
Net sales	1,390,098	1,649,329	2,146,315
Income (loss) from continuing operations before income taxes, noncontrolling interest	71,943	80,910	134,785
Corporate and Eliminations
Segment Reporting Information [Line Items]
Net sales	234,481	263,374	305,947
Income (loss) from continuing operations before income taxes, noncontrolling interest	27,751	29,086	32,667
Intercompany Eliminations
Segment Reporting Information [Line Items]
Net sales	(82,519)	(93,374)	(132,053)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes, noncontrolling interest	$ (172,855)	$ (241,612)	$ (67,080)