Revenue Recognition - Schedule of Disaggregates of Revenue (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 7,864,758	$ 8,328,909	$ 7,246,952
Recreation Vehicles [Member]
Disaggregation of Revenue [Line Items]
Net sales	7,694,758	8,155,015	7,098,957
Operating Segments | Recreation Vehicles [Member]
Disaggregation of Revenue [Line Items]
Net sales	7,694,758	8,155,015	7,098,957
Operating Segments | North America [Member] | Recreation Vehicles [Member]
Disaggregation of Revenue [Line Items]
Net sales	6,207,780	8,155,015	7,098,957
Operating Segments | Europe [Member] | Recreation Vehicles [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,486,978
Operating Segments | Travel Trailers And Other Towables | North America [Member] | Recreation Vehicles [Member]
Disaggregation of Revenue [Line Items]
Net sales	2,710,308	3,646,581	3,088,561
Operating Segments | Fifth Wheels Towables | North America [Member] | Recreation Vehicles [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,848,143	2,362,119	2,038,930
Operating Segments | Towables | North America [Member] | Recreation Vehicles [Member]
Disaggregation of Revenue [Line Items]
Net sales	4,558,451	6,008,700	5,127,491
Operating Segments | Class A Motorized | North America [Member] | Recreation Vehicles [Member]
Disaggregation of Revenue [Line Items]
Net sales	761,176	1,000,881	914,681
Operating Segments | Class C Motorized | North America [Member] | Recreation Vehicles [Member]
Disaggregation of Revenue [Line Items]
Net sales	824,449	1,047,376	968,899
Operating Segments | Class B Motorized | North America [Member] | Recreation Vehicles [Member]
Disaggregation of Revenue [Line Items]
Net sales	63,704	98,058	87,886
Operating Segments | Motorized | Recreation Vehicles [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,649,329	2,146,315	1,971,466
Operating Segments | Motorized | North America [Member] | Recreation Vehicles [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,649,329	2,146,315	1,971,466
Operating Segments | Motorcaravan | Europe [Member] | Recreation Vehicles [Member]
Disaggregation of Revenue [Line Items]
Net sales	960,155
Operating Segments | Campervan | Europe [Member] | Recreation Vehicles [Member]
Disaggregation of Revenue [Line Items]
Net sales	201,089
Operating Segments | Caravan | Europe [Member] | Recreation Vehicles [Member]
Disaggregation of Revenue [Line Items]
Net sales	172,144
Operating Segments | Other RV Related | Europe [Member] | Recreation Vehicles [Member]
Disaggregation of Revenue [Line Items]
Net sales	153,590
Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Net sales	263,374	305,947	253,557
Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net sales	$ (93,374)	$ (132,053)	$ (105,562)