Schedule of Segment Reporting Information, by Segment Balance Sheet Item (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016	Jul. 31, 2016
Segment Reporting Information [Line Items]
Total assets	$ 2,432,425		$ 2,432,425		$ 2,325,464
Depreciation and amortization expense, total	23,810	$ 11,407	50,405	$ 22,840
Capital acquisitions	23,797	8,670	50,290	23,584
Continuing Operations | Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Total assets	2,041,289		2,041,289		1,902,141
Depreciation and amortization expense, total	20,484	8,045	43,753	16,144
Capital acquisitions	22,342	6,805	48,363	20,604
Continuing Operations | Operating Segments | Recreational vehicles | Towables
Segment Reporting Information [Line Items]
Total assets	1,514,312		1,514,312		1,425,168
Depreciation and amortization expense, total	18,238	7,398	39,164	14,854
Capital acquisitions	15,453	5,482	36,318	18,288
Continuing Operations | Operating Segments | Recreational vehicles | Motorized
Segment Reporting Information [Line Items]
Total assets	526,977		526,977		476,973
Depreciation and amortization expense, total	2,246	647	4,589	1,290
Capital acquisitions	6,889	1,323	12,045	2,316
Continuing Operations | Operating Segments | Other
Segment Reporting Information [Line Items]
Total assets	151,852		151,852		156,822
Depreciation and amortization expense, total	3,012	3,073	6,016	6,129
Capital acquisitions	314	1,406	610	2,179
Continuing Operations | Operating Segments | Corporate
Segment Reporting Information [Line Items]
Total assets	239,284		239,284		$ 266,501
Depreciation and amortization expense, total	314	289	636	567
Capital acquisitions	$ 1,141	$ 459	$ 1,317	$ 801