Schedule of Segment Reporting Information, by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Jul. 31, 2012
Segment Reporting Information [Line Items]
Net Sales	$ 875,612	$ 673,000
Income (Loss) Before Income Taxes	47,611	34,648
Identifiable Assets	1,267,553		1,243,054
Recreation Vehicles
Segment Reporting Information [Line Items]
Net Sales	761,424	561,660
Income (Loss) Before Income Taxes	51,148	33,884
Identifiable Assets	830,537		817,343
Buses
Segment Reporting Information [Line Items]
Net Sales	114,188	111,340
Income (Loss) Before Income Taxes	3,691	5,266
Identifiable Assets	151,099		143,324
Corporate
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes	(7,228)	(4,502)
Identifiable Assets	285,917		282,387
Towables | Recreation Vehicles
Segment Reporting Information [Line Items]
Net Sales	639,182	499,104
Income (Loss) Before Income Taxes	42,710	32,591
Identifiable Assets	738,026		734,439
Motorized | Recreation Vehicles
Segment Reporting Information [Line Items]
Net Sales	122,242	62,556
Income (Loss) Before Income Taxes	8,438	1,293
Identifiable Assets	$ 92,511		$ 82,904