BUSINESS SEGMENTS - Schedule of Segment Reporting Information, by Segment Balance Sheet Item (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 5,771,460	$ 5,660,446
Depreciation and Intangible amortization expense	196,167	148,777	$ 93,223
Capital acquisitions	105,823	127,245	137,306
Property, plant and equipment, net	1,107,649	1,092,471
Germany
Segment Reporting Information [Line Items]
Property, plant and equipment, net	444,981	424,333
Other Europe
Segment Reporting Information [Line Items]
Property, plant and equipment, net	93,220	92,553
Non-US
Segment Reporting Information [Line Items]
Property, plant and equipment, net	5,277	5,944
Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Total assets	5,112,209	5,040,949
Depreciation and Intangible amortization expense	183,915	136,463	80,764
Capital acquisitions	101,987	122,153	119,964
Operating Segments | Recreational vehicles | North American
Segment Reporting Information [Line Items]
Total assets	2,010,138	1,963,145
Depreciation and Intangible amortization expense	80,244	81,582	80,764
Capital acquisitions	39,822	86,500	119,964
Operating Segments | Recreational vehicles | European
Segment Reporting Information [Line Items]
Total assets	3,102,071	3,077,804
Depreciation and Intangible amortization expense	103,671	54,881	0
Capital acquisitions	62,165	35,653	0
Operating Segments | Recreational vehicles | Towables
Segment Reporting Information [Line Items]
Total assets	1,529,913	1,516,519
Depreciation and Intangible amortization expense	66,042	67,751	68,964
Capital acquisitions	27,219	69,321	85,304
Operating Segments | Recreational vehicles | Motorized
Segment Reporting Information [Line Items]
Total assets	480,225	446,626
Depreciation and Intangible amortization expense	14,202	13,831	11,800
Capital acquisitions	12,603	17,179	34,660
Corporate and Eliminations
Segment Reporting Information [Line Items]
Total assets	212,378	163,897
Depreciation and Intangible amortization expense	10,488	10,647	10,861
Capital acquisitions	2,664	3,493	8,440
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Total assets	446,873	455,600
Depreciation and Intangible amortization expense	1,764	1,667	1,598
Capital acquisitions	$ 1,172	$ 1,599	$ 8,902