Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2016	Jan. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 975,071	$ 852,416	$ 2,005,422	$ 1,774,408
Income (loss) from continuing operations before income taxes	65,888	44,137	143,579	100,843
Corporate
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	(10,710)	(8,050)	(20,552)	(15,744)
Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	73,588	52,187	158,465	116,587
Operating Segments | Recreational vehicles | Towables
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	53,069	40,320	116,293	89,619
Operating Segments | Recreational vehicles | Motorized
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	20,519	11,867	42,172	26,968
Operating Segments | Other
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	3,010		5,666
Continuing Operations
Segment Reporting Information [Line Items]
Net sales	975,071	852,416	2,005,422	1,774,408
Continuing Operations | Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Net sales	941,185	852,416	1,936,963	1,774,408
Continuing Operations | Operating Segments | Recreational vehicles | Towables
Segment Reporting Information [Line Items]
Net sales	698,318	675,090	1,442,997	1,374,868
Continuing Operations | Operating Segments | Recreational vehicles | Motorized
Segment Reporting Information [Line Items]
Net sales	242,867	$ 177,326	493,966	$ 399,540
Continuing Operations | Operating Segments | Other
Segment Reporting Information [Line Items]
Net sales	48,011		98,393
Continuing Operations | Intercompany Eliminations
Segment Reporting Information [Line Items]
Net sales	$ (14,125)		$ (29,934)