Schedule of Segment Reporting Information, by Segment Balance Sheet Item (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Jul. 31, 2012
Segment Reporting Information [Line Items]
Identifiable Assets	$ 1,289,360	$ 1,243,054
Recreation Vehicles
Segment Reporting Information [Line Items]
Identifiable Assets	950,760	817,343
Buses
Segment Reporting Information [Line Items]
Identifiable Assets	142,867	143,324
Corporate
Segment Reporting Information [Line Items]
Identifiable Assets	195,733	282,387
Towables | Recreation Vehicles
Segment Reporting Information [Line Items]
Identifiable Assets	808,925	734,439
Motorized | Recreation Vehicles
Segment Reporting Information [Line Items]
Identifiable Assets	$ 141,835	$ 82,904