Schedule of Segment Reporting Information, by Segment Balance Sheet Item (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017	Jul. 31, 2017
Segment Reporting Information [Line Items]
Total assets	$ 2,708,959		$ 2,708,959		$ 2,557,931
Depreciation and amortization expense, total	23,275	$ 23,810	45,973	$ 50,405
Capital acquisitions	29,574	23,797	61,666	50,290
Continuing Operations | Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Total assets	2,315,014		2,315,014		2,035,790
Depreciation and amortization expense, total	20,132	20,484	39,653	43,753
Capital acquisitions	20,575	22,342	50,482	48,363
Continuing Operations | Operating Segments | Recreational vehicles | Towables
Segment Reporting Information [Line Items]
Total assets	1,689,874		1,689,874		1,535,029
Depreciation and amortization expense, total	17,223	18,238	34,016	39,164
Capital acquisitions	18,821	15,453	36,413	36,318
Continuing Operations | Operating Segments | Recreational vehicles | Motorized
Segment Reporting Information [Line Items]
Total assets	625,140		625,140		500,761
Depreciation and amortization expense, total	2,909	2,246	5,637	4,589
Capital acquisitions	1,754	6,889	14,069	12,045
Continuing Operations | Operating Segments | Other
Segment Reporting Information [Line Items]
Total assets	159,630		159,630		156,996
Depreciation and amortization expense, total	2,748	3,012	5,557	6,016
Capital acquisitions	1,983	314	2,593	610
Continuing Operations | Operating Segments | Corporate
Segment Reporting Information [Line Items]
Total assets	234,315		234,315		$ 365,145
Depreciation and amortization expense, total	395	314	763	636
Capital acquisitions	$ 7,016	$ 1,141	$ 8,591	$ 1,317