Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Segment Reporting Information [Line Items]
Net sales	$ 4,582,112	$ 4,006,819	$ 3,525,456
Income (loss) from continuing operations before income taxes	383,313	292,895	252,819
Corporate
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	(45,608)	(33,813)	(25,581)
Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	410,397	325,838	278,400
Operating Segments | Recreational vehicles | Towables
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	321,874	259,092	221,123
Operating Segments | Recreational vehicles | Motorized
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	88,523	66,746	57,277
Operating Segments | Other
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	18,547	1,424
Intercompany Eliminations
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	(23)	(554)
Continuing Operations
Segment Reporting Information [Line Items]
Net sales	4,582,112	4,006,819	3,525,456
Continuing Operations | Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Net sales	4,432,909	3,967,204	3,525,456
Continuing Operations | Operating Segments | Recreational vehicles | Towables
Segment Reporting Information [Line Items]
Net sales	3,338,659	3,096,405	2,721,625
Continuing Operations | Operating Segments | Recreational vehicles | Motorized
Segment Reporting Information [Line Items]
Net sales	1,094,250	870,799	$ 803,831
Continuing Operations | Operating Segments | Other
Segment Reporting Information [Line Items]
Net sales	218,673	56,594
Continuing Operations | Intercompany Eliminations
Segment Reporting Information [Line Items]
Net sales	$ (69,470)	$ (16,979)