Business Segments - Schedule of Reporting Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Jul. 31, 2019
Segment Reporting Information [Line Items]
Net sales	$ 2,158,785	$ 1,755,976
Income (loss) from continuing operations before income taxes	68,634	31,517
Total assets	5,607,541		$ 5,660,446
Depreciation and amortization expense, total	50,207	23,058
Capital acquisitions	30,023	32,141
Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Net sales	2,109,784	1,710,296
Income (loss) from continuing operations before income taxes	103,073	96,262
Total assets	5,087,857		5,040,949
Depreciation and amortization expense, total	47,248	20,067
Capital acquisitions	28,870	29,661
Operating Segments | Recreational vehicles | North American
Segment Reporting Information [Line Items]
Net sales	1,616,777	1,710,296
Income (loss) from continuing operations before income taxes	126,097	96,262
Total assets	2,059,036		1,963,145
Depreciation and amortization expense, total	19,765	20,067
Capital acquisitions	13,843	29,661
Operating Segments | Recreational vehicles | North American | Towables
Segment Reporting Information [Line Items]
Net sales	1,200,888	1,279,098
Income (loss) from continuing operations before income taxes	104,322	74,550
Total assets	1,582,250		1,516,519
Depreciation and amortization expense, total	16,271	16,631
Capital acquisitions	11,275	22,242
Operating Segments | Recreational vehicles | North American | Motorized
Segment Reporting Information [Line Items]
Net sales	415,889	431,198
Income (loss) from continuing operations before income taxes	21,775	21,712
Total assets	476,786		446,626
Depreciation and amortization expense, total	3,494	3,436
Capital acquisitions	2,568	7,419
Operating Segments | Recreational vehicles | European
Segment Reporting Information [Line Items]
Net sales	493,007	0
Income (loss) from continuing operations before income taxes	(23,024)	0
Total assets	3,028,821		3,077,804
Depreciation and amortization expense, total	27,483	0
Capital acquisitions	15,027	0
Other, net
Segment Reporting Information [Line Items]
Net sales	73,566	73,848
Income (loss) from continuing operations before income taxes	11,751	5,910
Total assets	166,271		163,897
Depreciation and amortization expense, total	2,511	2,574
Capital acquisitions	655	2,444
Corporate
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	(46,190)	(70,655)
Total assets	353,413		$ 455,600
Depreciation and amortization expense, total	448	417
Capital acquisitions	498	36
Intercompany eliminations
Segment Reporting Information [Line Items]
Net sales	$ (24,565)	$ (28,168)