Revenue Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 2,158,785	$ 1,755,976
Operating Segments | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	2,109,784	1,710,296
Operating Segments | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	1,616,777	1,710,296
Operating Segments | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	493,007	0
Operating Segments | Travel Trailers And Other Towables | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	709,665	761,484
Operating Segments | Fifth Wheels Towables | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	491,223	517,614
Operating Segments | Towables | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	1,200,888	1,279,098
Operating Segments | Class A Motorized | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	161,732	227,274
Operating Segments | Class C Motorized | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	229,837	184,384
Operating Segments | Class B Motorized | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	24,320	19,540
Operating Segments | Motorized | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	415,889	431,198
Operating Segments | Motorcaravan | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	281,733	0
Operating Segments | Campervan | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	77,597	0
Operating Segments | Caravan | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	61,032	0
Operating Segments | Other RV Related | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	72,645	0
Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Net sales	73,566	73,848
Intercompany eliminations
Disaggregation of Revenue [Line Items]
Net sales	$ (24,565)	$ (28,168)