Revenue Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 1,681,735	$ 2,506,583	$ 5,843,653	$ 5,553,135
Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	1,652,771	2,464,002
Operating Segments | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	1,652,771	2,464,002	5,727,257	5,427,357
Operating Segments | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	1,037,428	1,696,493	3,981,792	4,659,848
Operating Segments | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	615,343	767,509	1,745,465	767,509
Operating Segments | Travel Trailers And Other Towables | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	455,434	734,028	1,748,220	2,031,291
Operating Segments | Fifth Wheels Towables | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	317,957	503,227	1,209,966	1,366,626
Operating Segments | Towables | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	773,391	1,237,255	2,958,186	3,397,917
Operating Segments | Class A Motorized | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	96,849	201,927	384,055	602,689
Operating Segments | Class C Motorized | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	144,826	242,912	561,424	609,798
Operating Segments | Class B Motorized | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	22,362	14,399	78,127	49,444
Operating Segments | Motorized | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	264,037	459,238	1,023,606	1,261,931
Operating Segments | Motorcaravan | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	380,023	506,964	1,044,178	506,964
Operating Segments | Campervan | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	104,486	94,226	280,006	94,226
Operating Segments | Caravan | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	65,790	100,741	196,731	100,741
Operating Segments | Other RV Related | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	65,044	65,578	224,550	65,578
Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Net sales	45,632	69,506	176,943	198,468
Intercompany eliminations
Disaggregation of Revenue [Line Items]
Net sales	$ (16,668)	$ (26,925)	$ (60,547)	$ (72,690)