Schedule of Segment Reporting Information, by Segment Balance Sheet Item (Detail) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Jul. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 2,800,428		$ 2,778,665
Depreciation and amortization expense, total	23,058	$ 22,698
Capital acquisitions	32,141	32,092
Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Total assets	2,188,978		2,147,191
Depreciation and amortization expense, total	20,067	19,521
Capital acquisitions	29,661	29,907
Operating Segments | Recreational vehicles | Towables
Segment Reporting Information [Line Items]
Total assets	1,682,272		1,654,361
Depreciation and amortization expense, total	16,631	16,793
Capital acquisitions	22,242	17,592
Operating Segments | Recreational vehicles | Motorized
Segment Reporting Information [Line Items]
Total assets	506,706		492,830
Depreciation and amortization expense, total	3,436	2,728
Capital acquisitions	7,419	12,315
Corporate and Eliminations
Segment Reporting Information [Line Items]
Total assets	174,151		167,965
Depreciation and amortization expense, total	2,574	2,809
Capital acquisitions	2,444	610
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total assets	437,299		$ 463,509
Depreciation and amortization expense, total	417	368
Capital acquisitions	$ 36	$ 1,575