BUSINESS SEGMENTS - Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Segment Reporting Information [Line Items]
Net sales	$ 12,317,380	$ 8,167,933	$ 7,864,758
Income (loss) from continuing operations before income taxes, noncontrolling interest	844,581	272,896	184,666
Operating Segments
Segment Reporting Information [Line Items]
Net sales	12,091,398	8,015,971	7,694,758
Income (loss) from continuing operations before income taxes, noncontrolling interest	977,597	418,000	397,192
Operating Segments | Total North America
Segment Reporting Information [Line Items]
Net sales	8,891,319	5,530,580	6,207,780
Income (loss) from continuing operations before income taxes, noncontrolling interest	861,021	408,150	403,138
Operating Segments | North American Towables
Segment Reporting Information [Line Items]
Net sales	6,221,928	4,140,482	4,558,451
Income (loss) from continuing operations before income taxes, noncontrolling interest	658,964	336,207	322,228
Operating Segments | North American Motorized
Segment Reporting Information [Line Items]
Net sales	2,669,391	1,390,098	1,649,329
Income (loss) from continuing operations before income taxes, noncontrolling interest	202,057	71,943	80,910
Operating Segments | European
Segment Reporting Information [Line Items]
Net sales	3,200,079	2,485,391	1,486,978
Income (loss) from continuing operations before income taxes, noncontrolling interest	116,576	9,850	(5,946)
Other
Segment Reporting Information [Line Items]
Net sales	373,174	234,481	263,374
Income (loss) from continuing operations before income taxes, noncontrolling interest	57,674	27,751	29,086
Intercompany Eliminations
Segment Reporting Information [Line Items]
Net sales	(147,192)	(82,519)	(93,374)
Corporate
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes, noncontrolling interest	$ (190,690)	$ (172,855)	$ (241,612)