Business Segments - Schedule of Reporting Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Jul. 31, 2021
Segment Reporting Information [Line Items]
Net sales	$ 3,958,224	$ 2,537,360
Income (loss) from continuing operations before income taxes	312,842	146,319
Total assets	7,768,771		$ 6,654,088
Depreciation and amortization expense, total	64,953	54,239
Capital acquisitions	41,016	22,852
Operating segments | Recreational vehicles
Segment Reporting Information [Line Items]
Net sales	3,798,859	2,488,387
Income (loss) from continuing operations before income taxes	337,204	177,240
Total assets	6,254,228		5,919,904
Depreciation and amortization expense, total	58,037	50,900
Capital acquisitions	36,565	21,047
Operating segments | Recreational vehicles | North America
Segment Reporting Information [Line Items]
Net sales	3,165,862	1,885,899
Income (loss) from continuing operations before income taxes	355,180	182,746
Total assets	3,381,400		2,944,083
Depreciation and amortization expense, total	23,324	19,577
Capital acquisitions	21,763	11,153
Operating segments | Recreational vehicles | North America | North American Towables
Segment Reporting Information [Line Items]
Net sales	2,240,834	1,392,044
Income (loss) from continuing operations before income taxes	266,282	141,179
Total assets	2,137,149		1,870,577
Depreciation and amortization expense, total	16,302	15,807
Capital acquisitions	13,134	9,408
Operating segments | Recreational vehicles | North America | North American Motorized
Segment Reporting Information [Line Items]
Net sales	925,028	493,855
Income (loss) from continuing operations before income taxes	88,898	41,567
Total assets	1,244,251		1,073,506
Depreciation and amortization expense, total	7,022	3,770
Capital acquisitions	8,629	1,745
Operating segments | Recreational vehicles | European
Segment Reporting Information [Line Items]
Net sales	632,997	602,488
Income (loss) from continuing operations before income taxes	(17,976)	(5,506)
Total assets	2,872,828		2,975,821
Depreciation and amortization expense, total	34,713	31,323
Capital acquisitions	14,802	9,894
Other, net
Segment Reporting Information [Line Items]
Net sales	257,830	80,707
Income (loss) from continuing operations before income taxes	23,529	11,490
Total assets	1,223,899		272,350
Depreciation and amortization expense, total	6,480	2,911
Capital acquisitions	4,417	1,444
Corporate
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	(47,891)	(42,411)
Total assets	290,644		$ 461,834
Depreciation and amortization expense, total	436	428
Capital acquisitions	34	361
Intercompany eliminations
Segment Reporting Information [Line Items]
Net sales	$ (98,465)	$ (31,734)