Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 1,290,576	$ 1,971,560	$ 3,046,552	$ 4,203,228
Income (loss) from continuing operations before income taxes	1,873	141,065	33,390	328,156
Operating Segments | Towables
Segment Reporting Information [Line Items]
Net sales	881,564	1,373,118	2,160,662	2,991,619
Operating Segments | Motorized
Segment Reporting Information [Line Items]
Net sales	371,495	559,909	802,693	1,126,520
Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Net sales	1,253,059	1,933,027	2,963,355	4,118,139
Income (loss) from continuing operations before income taxes	51,265	154,266	147,527	350,703
Operating Segments | Recreational vehicles | Towables
Segment Reporting Information [Line Items]
Net sales	881,564	1,373,118	2,160,662	2,991,619
Income (loss) from continuing operations before income taxes	34,060	116,728	108,610	275,579
Operating Segments | Recreational vehicles | Motorized
Segment Reporting Information [Line Items]
Net sales	371,495	559,909	802,693	1,126,520
Income (loss) from continuing operations before income taxes	17,205	37,538	38,917	75,124
Corporate and Eliminations
Segment Reporting Information [Line Items]
Net sales	55,114	68,013	128,962	150,932
Income (loss) from continuing operations before income taxes	5,950	5,290	11,860	13,773
Intercompany Eliminations
Segment Reporting Information [Line Items]
Net sales	(17,597)	(29,480)	(45,765)	(65,843)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	$ (55,342)	$ (18,491)	$ (125,997)	$ (36,320)