Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 1,708,531	$ 1,030,351
Income (loss) from continuing operations before income taxes	115,800	77,691
Corporate
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	(13,674)	(9,842)
Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	123,096	84,877
Operating Segments | Recreational vehicles | Towables
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	94,173	63,224
Operating Segments | Recreational vehicles | Motorized
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	28,923	21,653
Operating Segments | Other
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	6,378	2,656
Continuing Operations
Segment Reporting Information [Line Items]
Net sales	1,708,531	1,030,351
Continuing Operations | Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Net sales	1,672,327	995,778
Continuing Operations | Operating Segments | Recreational vehicles | Towables
Segment Reporting Information [Line Items]
Net sales	1,210,873	744,679
Continuing Operations | Operating Segments | Recreational vehicles | Motorized
Segment Reporting Information [Line Items]
Net sales	461,454	251,099
Continuing Operations | Operating Segments | Other
Segment Reporting Information [Line Items]
Net sales	58,996	50,382
Continuing Operations | Intercompany Eliminations
Segment Reporting Information [Line Items]
Net sales	$ (22,792)	$ (15,809)