Schedule of Segment Reporting Information, by Segment Balance Sheet Item (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018	Jul. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 2,730,198		$ 2,730,198		$ 2,778,665
Depreciation and amortization expense, total	23,522	$ 23,275	46,580	$ 45,973
Capital acquisitions	17,776	29,574	49,917	61,666
Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Total assets	2,016,390		2,016,390		2,147,191
Depreciation and amortization expense, total	20,414	20,132	40,481	39,653
Capital acquisitions	17,064	20,575	46,725	50,482
Operating Segments | Recreational vehicles | Towables
Segment Reporting Information [Line Items]
Total assets	1,541,673		1,541,673		1,654,361
Depreciation and amortization expense, total	16,971	17,223	33,602	34,016
Capital acquisitions	14,255	18,821	36,497	36,413
Operating Segments | Recreational vehicles | Motorized
Segment Reporting Information [Line Items]
Total assets	474,717		474,717		492,830
Depreciation and amortization expense, total	3,443	2,909	6,879	5,637
Capital acquisitions	2,809	1,754	10,228	14,069
Corporate and Eliminations
Segment Reporting Information [Line Items]
Total assets	163,964		163,964		167,965
Depreciation and amortization expense, total	2,693	2,748	5,267	5,557
Capital acquisitions	287	1,983	2,731	2,593
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total assets	549,844		549,844		$ 463,509
Depreciation and amortization expense, total	415	395	832	763
Capital acquisitions	$ 425	$ 7,016	$ 461	$ 8,591