Schedule of Segment Reporting Information, by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Segment Reporting Information [Line Items]
Net Sales	$ 741,600	$ 596,970	$ 1,617,212	$ 1,269,970
Income (Loss) Before Income Taxes	25,531	21,496	73,142	56,144
Recreation Vehicles
Segment Reporting Information [Line Items]
Net Sales	636,605	500,994	1,398,029	1,062,654
Income (Loss) Before Income Taxes	30,968	22,924	82,116	56,808
Buses
Segment Reporting Information [Line Items]
Net Sales	104,995	95,976	219,183	207,316
Income (Loss) Before Income Taxes	1,321	2,599	5,012	7,865
Corporate
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes	(6,758)	(4,027)	(13,986)	(8,529)
Towables | Recreation Vehicles
Segment Reporting Information [Line Items]
Net Sales	522,838	444,206	1,162,020	943,310
Income (Loss) Before Income Taxes	24,085	21,169	66,795	53,760
Motorized | Recreation Vehicles
Segment Reporting Information [Line Items]
Net Sales	113,767	56,788	236,009	119,344
Income (Loss) Before Income Taxes	$ 6,883	$ 1,755	$ 15,321	$ 3,048