Business Segments - Schedule of Reporting Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Jul. 31, 2020
Segment Reporting Information [Line Items]
Net sales	$ 2,537,360	$ 2,158,785
Income (loss) from continuing operations before income taxes	146,319	68,634
Total assets	5,860,922		$ 5,771,460
Depreciation and amortization expense, total	54,239	50,207
Capital acquisitions	22,852	30,023
Operating segments | Recreational vehicles
Segment Reporting Information [Line Items]
Net sales	2,488,387	2,109,784
Income (loss) from continuing operations before income taxes	177,240	103,073
Total assets	5,314,980		5,112,209
Depreciation and amortization expense, total	50,900	47,248
Capital acquisitions	21,047	28,870
Operating segments | Recreational vehicles | North American
Segment Reporting Information [Line Items]
Net sales	1,885,899	1,616,777
Income (loss) from continuing operations before income taxes	182,746	126,097
Total assets	2,342,270		2,010,138
Depreciation and amortization expense, total	19,577	19,765
Capital acquisitions	11,153	13,843
Operating segments | Recreational vehicles | North American | North American Towables
Segment Reporting Information [Line Items]
Net sales	1,392,044	1,200,888
Income (loss) from continuing operations before income taxes	141,179	104,322
Total assets	1,698,128		1,529,913
Depreciation and amortization expense, total	15,807	16,271
Capital acquisitions	9,408	11,275
Operating segments | Recreational vehicles | North American | North American Motorized
Segment Reporting Information [Line Items]
Net sales	493,855	415,889
Income (loss) from continuing operations before income taxes	41,567	21,775
Total assets	644,142		480,225
Depreciation and amortization expense, total	3,770	3,494
Capital acquisitions	1,745	2,568
Operating segments | Recreational vehicles | European
Segment Reporting Information [Line Items]
Net sales	602,488	493,007
Income (loss) from continuing operations before income taxes	(5,506)	(23,024)
Total assets	2,972,710		3,102,071
Depreciation and amortization expense, total	31,323	27,483
Capital acquisitions	9,894	15,027
Other
Segment Reporting Information [Line Items]
Net sales	80,707	73,566
Income (loss) from continuing operations before income taxes	11,490	11,751
Total assets	236,081		212,378
Depreciation and amortization expense, total	2,911	2,511
Capital acquisitions	1,444	655
Corporate
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	(42,411)	(46,190)
Total assets	309,861		$ 446,873
Depreciation and amortization expense, total	428	448
Capital acquisitions	361	498
Intercompany eliminations
Segment Reporting Information [Line Items]
Net sales	$ (31,734)	$ (24,565)