Schedule of Segment Reporting Information, by Segment Balance Sheet Item (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016	Jul. 31, 2016
Segment Reporting Information [Line Items]
Total assets	$ 2,600,076		$ 2,600,076		$ 2,325,464
Depreciation and amortization expense, total	23,893	$ 12,273	74,298	$ 35,113
Capital acquisitions	28,233	15,250	78,523	38,834
Continuing Operations | Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Total assets	2,149,445		2,149,445		1,902,141
Depreciation and amortization expense, total	20,529	8,882	64,282	25,026
Capital acquisitions	27,693	14,049	76,056	34,653
Continuing Operations | Operating Segments | Recreational vehicles | Towables
Segment Reporting Information [Line Items]
Total assets	1,589,720		1,589,720		1,425,168
Depreciation and amortization expense, total	18,213	8,212	57,377	23,066
Capital acquisitions	15,559	9,480	51,877	27,768
Continuing Operations | Operating Segments | Recreational vehicles | Motorized
Segment Reporting Information [Line Items]
Total assets	559,725		559,725		476,973
Depreciation and amortization expense, total	2,316	670	6,905	1,960
Capital acquisitions	12,134	4,569	24,179	6,885
Continuing Operations | Operating Segments | Other
Segment Reporting Information [Line Items]
Total assets	154,965		154,965		156,822
Depreciation and amortization expense, total	3,021	3,105	9,037	9,234
Capital acquisitions	163	340	773	2,519
Continuing Operations | Operating Segments | Corporate
Segment Reporting Information [Line Items]
Total assets	295,666		295,666		$ 266,501
Depreciation and amortization expense, total	343	286	979	853
Capital acquisitions	$ 377	$ 861	$ 1,694	$ 1,662