Schedule of Segment Reporting Information by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Segment Reporting Information [Line Items]
Net sales	$ 852,416	$ 635,330	$ 1,774,408	$ 1,435,293
Income (loss) from continuing operations before income taxes	44,137	23,902	100,843	78,343
Recreation Vehicles
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	52,187	30,108	116,587	89,175
Recreation Vehicles | Towables
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	40,320	18,915	89,619	64,539
Recreation Vehicles | Motorized
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	11,867	11,193	26,968	24,636
Corporate
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	(8,050)	(6,206)	(15,744)	(10,832)
Continuing Operations | Recreation Vehicles
Segment Reporting Information [Line Items]
Net sales	852,416	635,330	1,774,408	1,435,293
Continuing Operations | Recreation Vehicles | Towables
Segment Reporting Information [Line Items]
Net sales	675,090	472,474	1,374,868	1,095,327
Continuing Operations | Recreation Vehicles | Motorized
Segment Reporting Information [Line Items]
Net sales	$ 177,326	$ 162,856	$ 399,540	$ 339,966