Schedule of Segment Reporting Information by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Segment Reporting Information [Line Items]
Net sales	$ 921,992	$ 799,963
Income (loss) from continuing operations before income taxes	56,706	54,441
Recreation Vehicles
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	64,400	59,067
Recreation Vehicles | Towables
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	49,299	45,624
Recreation Vehicles | Motorized
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	15,101	13,443
Corporate
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	(7,694)	(4,626)
Continuing Operations | Recreation Vehicles
Segment Reporting Information [Line Items]
Net sales	921,992	799,963
Continuing Operations | Recreation Vehicles | Towables
Segment Reporting Information [Line Items]
Net sales	699,778	622,853
Continuing Operations | Recreation Vehicles | Motorized
Segment Reporting Information [Line Items]
Net sales	$ 222,214	$ 177,110