Business Segments - Schedule of Reporting Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021	Jul. 31, 2021
Segment Reporting Information [Line Items]
Net sales	$ 3,875,018	$ 2,727,788	$ 7,833,242	$ 5,265,148
Income (loss) from continuing operations before income taxes	346,253	163,959	659,095	310,278
Total assets	7,665,145		7,665,145		$ 6,654,088
Depreciation and amortization expense, total	75,895	56,715	140,848	110,954
Capital acquisitions	75,407	25,209	116,423	48,061
Operating segments | Recreational vehicles
Segment Reporting Information [Line Items]
Net sales	3,685,624	2,683,639	7,484,483	5,172,026
Income (loss) from continuing operations before income taxes	389,597	201,517	726,801	378,757
Total assets	6,071,010		6,071,010		5,919,904
Depreciation and amortization expense, total	57,116	53,260	115,153	104,160
Capital acquisitions	67,595	23,965	104,160	45,012
Operating segments | Recreational vehicles | North America
Segment Reporting Information [Line Items]
Net sales	2,961,894	1,950,176	6,127,756	3,836,075
Income (loss) from continuing operations before income taxes	379,932	191,301	735,112	374,047
Total assets	3,400,438		3,400,438		2,944,083
Depreciation and amortization expense, total	23,420	21,652	46,744	41,229
Capital acquisitions	28,170	10,643	49,933	21,796
Operating segments | Recreational vehicles | North America | North American Towables
Segment Reporting Information [Line Items]
Net sales	1,985,088	1,373,181	4,225,922	2,765,225
Income (loss) from continuing operations before income taxes	275,895	147,880	542,177	289,059
Total assets	2,172,879		2,172,879		1,870,577
Depreciation and amortization expense, total	16,313	16,318	32,615	32,125
Capital acquisitions	21,479	6,913	34,613	16,321
Operating segments | Recreational vehicles | North America | North American Motorized
Segment Reporting Information [Line Items]
Net sales	976,806	576,995	1,901,834	1,070,850
Income (loss) from continuing operations before income taxes	104,037	43,421	192,935	84,988
Total assets	1,227,559		1,227,559		1,073,506
Depreciation and amortization expense, total	7,107	5,334	14,129	9,104
Capital acquisitions	6,691	3,730	15,320	5,475
Operating segments | Recreational vehicles | Europe
Segment Reporting Information [Line Items]
Net sales	723,730	733,463	1,356,727	1,335,951
Income (loss) from continuing operations before income taxes	9,665	10,216	(8,311)	4,710
Total assets	2,670,572		2,670,572		2,975,821
Depreciation and amortization expense, total	33,696	31,608	68,409	62,931
Capital acquisitions	39,425	13,322	54,227	23,216
Other, net
Segment Reporting Information [Line Items]
Net sales	294,146	74,714	551,976	155,421
Income (loss) from continuing operations before income taxes	23,092	9,644	46,621	21,134
Total assets	1,244,227		1,244,227		272,350
Depreciation and amortization expense, total	18,357	3,039	24,837	5,950
Capital acquisitions	7,763	1,216	12,180	2,660
Corporate
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	(66,436)	(47,202)	(114,327)	(89,613)
Total assets	349,908		349,908		$ 461,834
Depreciation and amortization expense, total	422	416	858	844
Capital acquisitions	49	28	83	389
Intercompany eliminations
Segment Reporting Information [Line Items]
Net sales	$ (104,752)	$ (30,565)	$ (203,217)	$ (62,299)