REVENUE RECOGNITION (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 8,167,933	$ 7,864,758	$ 8,328,909
Recreation Vehicles
Disaggregation of Revenue [Line Items]
Net sales	8,015,971	7,694,758	8,155,015
Operating Segments | Recreation Vehicles
Disaggregation of Revenue [Line Items]
Net sales	8,015,971	7,694,758	8,155,015
Operating Segments | North America | Recreation Vehicles
Disaggregation of Revenue [Line Items]
Net sales	5,530,580	6,207,780	8,155,015
Operating Segments | Europe | Recreation Vehicles
Disaggregation of Revenue [Line Items]
Net sales	2,485,391	1,486,978	0
Operating Segments | Travel Trailers And Other Towables | North America | Recreation Vehicles
Disaggregation of Revenue [Line Items]
Net sales	2,449,239	2,710,308	3,646,581
Operating Segments | Fifth Wheels Towables | North America | Recreation Vehicles
Disaggregation of Revenue [Line Items]
Net sales	1,691,243	1,848,143	2,362,119
Operating Segments | Towables | Recreation Vehicles
Disaggregation of Revenue [Line Items]
Net sales	4,140,482	4,558,451	6,008,700
Operating Segments | Towables | North America | Recreation Vehicles
Disaggregation of Revenue [Line Items]
Net sales	4,140,482	4,558,451	6,008,700
Operating Segments | Class A Motorized | North America | Recreation Vehicles
Disaggregation of Revenue [Line Items]
Net sales	495,520	761,176	1,000,881
Operating Segments | Class C Motorized | North America | Recreation Vehicles
Disaggregation of Revenue [Line Items]
Net sales	776,191	824,449	1,047,376
Operating Segments | Class B Motorized | North America | Recreation Vehicles
Disaggregation of Revenue [Line Items]
Net sales	118,387	63,704	98,058
Operating Segments | Motorized | Recreation Vehicles
Disaggregation of Revenue [Line Items]
Net sales	1,390,098	1,649,329	2,146,315
Operating Segments | Motorized | North America | Recreation Vehicles
Disaggregation of Revenue [Line Items]
Net sales	1,390,098	1,649,329	2,146,315
Operating Segments | Motorcaravan | Europe | Recreation Vehicles
Disaggregation of Revenue [Line Items]
Net sales	1,505,353	960,155	0
Operating Segments | Campervan | Europe | Recreation Vehicles
Disaggregation of Revenue [Line Items]
Net sales	433,398	201,089	0
Operating Segments | Caravan | Europe | Recreation Vehicles
Disaggregation of Revenue [Line Items]
Net sales	273,475	172,144	0
Operating Segments | Other RV-related | Europe | Recreation Vehicles
Disaggregation of Revenue [Line Items]
Net sales	273,165	153,590	0
Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Net sales	234,481	263,374	305,947
Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net sales	$ (82,519)	$ (93,374)	$ (132,053)