Schedule of Segment Reporting Information by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Segment Reporting Information [Line Items]
Net sales	$ 1,046,823	$ 929,765	$ 2,482,116	$ 2,327,794
Income (loss) from continuing operations before income taxes	82,748	70,563	161,091	139,189
Recreation Vehicles
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	90,241	77,622	179,416	159,738
Recreation Vehicles | Towables
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	72,572	62,540	137,111	129,335
Recreation Vehicles | Motorized
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	17,669	15,082	42,305	30,403
Corporate
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	(7,493)	(7,059)	(18,325)	(20,549)
Continuing Operations | Recreation Vehicles
Segment Reporting Information [Line Items]
Net sales	1,046,823	929,765	2,482,116	2,327,794
Continuing Operations | Recreation Vehicles | Towables
Segment Reporting Information [Line Items]
Net sales	800,737	742,429	1,896,064	1,904,449
Continuing Operations | Recreation Vehicles | Motorized
Segment Reporting Information [Line Items]
Net sales	$ 246,086	$ 187,336	$ 586,052	$ 423,345