Schedule of Segment Reporting Information, by Segment Balance Sheet Item (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018	Jul. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 5,972,320		$ 5,972,320		$ 2,778,665
Depreciation and amortization expense, total	50,930	$ 23,533	97,510	$ 69,506
Capital acquisitions	32,647	34,171	82,564	95,837
Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Total assets	5,241,785		5,241,785		2,147,191
Depreciation and amortization expense, total	47,818	20,361	88,299	60,014
Capital acquisitions	31,980	33,258	78,705	83,740
Operating Segments | Recreational vehicles | North American [Member]
Segment Reporting Information [Line Items]
Total assets	2,114,564		2,114,564		2,147,191
Depreciation and amortization expense, total	20,591	20,361	61,072	60,014
Capital acquisitions	16,101	33,258	62,826	83,740
Operating Segments | Recreational vehicles | European [Member]
Segment Reporting Information [Line Items]
Total assets	3,127,221		3,127,221		0
Depreciation and amortization expense, total	27,227	0	27,227	0
Operating Segments | Recreational vehicles | European [Member] | Rental vehicles [Member]
Segment Reporting Information [Line Items]
Capital acquisitions	15,879	0	15,879	0
Operating Segments | Recreational vehicles | North American Towables
Segment Reporting Information [Line Items]
Total assets	1,593,377		1,593,377		1,654,361
Depreciation and amortization expense, total	17,097	17,357	50,699	51,373
Capital acquisitions	13,013	23,175	49,510	59,588
Operating Segments | Recreational vehicles | North American Motorized
Segment Reporting Information [Line Items]
Total assets	521,187		521,187		492,830
Depreciation and amortization expense, total	3,494	3,004	10,373	8,641
Capital acquisitions	3,088	10,083	13,316	24,152
Corporate and Eliminations
Segment Reporting Information [Line Items]
Total assets	160,661		160,661		167,965
Depreciation and amortization expense, total	2,705	2,762	7,972	8,319
Capital acquisitions	248	744	2,979	3,337
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total assets	569,874		569,874		$ 463,509
Depreciation and amortization expense, total	407	410	1,239	1,173
Capital acquisitions	$ 419	$ 169	$ 880	$ 8,760