REVENUE RECOGNITION (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 12,317,380	$ 8,167,933	$ 7,864,758
Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	12,091,398	8,015,971	7,694,758
Operating Segments | Total North America
Disaggregation of Revenue [Line Items]
Net sales	8,891,319	5,530,580	6,207,780
Operating Segments | North American Towables
Disaggregation of Revenue [Line Items]
Net sales	6,221,928	4,140,482	4,558,451
Operating Segments | North American Motorized
Disaggregation of Revenue [Line Items]
Net sales	2,669,391	1,390,098	1,649,329
Operating Segments | European
Disaggregation of Revenue [Line Items]
Net sales	3,200,079	2,485,391	1,486,978
Operating Segments | Travel Trailers And Other Towables | North American Towables
Disaggregation of Revenue [Line Items]
Net sales	3,791,235	2,449,239	2,710,308
Operating Segments | Fifth Wheels Towables | North American Towables
Disaggregation of Revenue [Line Items]
Net sales	2,430,693	1,691,243	1,848,143
Operating Segments | Class A Motorized | North American Motorized
Disaggregation of Revenue [Line Items]
Net sales	1,052,982	495,520	761,176
Operating Segments | Class C Motorized | North American Motorized
Disaggregation of Revenue [Line Items]
Net sales	1,266,624	776,191	824,449
Operating Segments | Class B Motorized | North American Motorized
Disaggregation of Revenue [Line Items]
Net sales	349,785	118,387	63,704
Operating Segments | Motorcaravan | European
Disaggregation of Revenue [Line Items]
Net sales	1,779,906	1,505,353	960,155
Operating Segments | Campervan | European
Disaggregation of Revenue [Line Items]
Net sales	779,755	433,398	201,089
Operating Segments | Caravan | European
Disaggregation of Revenue [Line Items]
Net sales	292,708	273,475	172,144
Operating Segments | Other RV-related | European
Disaggregation of Revenue [Line Items]
Net sales	347,710	273,165	153,590
Other
Disaggregation of Revenue [Line Items]
Net sales	373,174	234,481	263,374
Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net sales	$ (147,192)	$ (82,519)	$ (93,374)