Schedule of Segment Reporting Information by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Segment Reporting Information [Line Items]
Net sales	$ 1,174,255	$ 1,046,823	$ 2,948,663	$ 2,482,116
Income (loss) from continuing operations before income taxes	94,561	82,748	195,404	161,091
Recreation Vehicles
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	103,624	90,241	220,211	179,416
Recreation Vehicles | Towables
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	83,771	72,572	173,390	137,111
Recreation Vehicles | Motorized
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	19,853	17,669	46,821	42,305
Corporate
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	(9,063)	(7,493)	(24,807)	(18,325)
Continuing Operations | Recreation Vehicles
Segment Reporting Information [Line Items]
Net sales	1,174,255	1,046,823	2,948,663	2,482,116
Continuing Operations | Recreation Vehicles | Towables
Segment Reporting Information [Line Items]
Net sales	919,358	800,737	2,294,226	1,896,064
Continuing Operations | Recreation Vehicles | Motorized
Segment Reporting Information [Line Items]
Net sales	$ 254,897	$ 246,086	$ 654,437	$ 586,052