Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 3,459,264	$ 1,681,735	$ 8,724,412	$ 5,843,653
Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	3,395,735	1,652,771
Operating segments | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	3,395,735	1,652,771	8,567,761	5,727,257
Operating segments | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	2,501,495	1,037,428	6,337,570	3,981,792
Operating segments | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	894,240	615,343	2,230,191	1,745,465
Operating segments | Travel Trailers | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	1,060,058	455,434	2,729,317	1,748,220
Operating segments | Fifth Wheels | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	666,044	317,957	1,762,010	1,209,966
Operating segments | North American Towables | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	1,726,102	773,391	4,491,327	2,958,186
Operating segments | Class A | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	323,547	96,849	704,230	384,055
Operating segments | Class C | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	342,425	144,826	912,124	561,424
Operating segments | Class B | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	109,421	22,362	229,889	78,127
Operating segments | North American Motorized | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	775,393	264,037	1,846,243	1,023,606
Operating segments | Motorcaravan | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	489,702	380,023	1,227,182	1,044,178
Operating segments | Campervan | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	236,988	104,486	529,500	280,006
Operating segments | Caravan | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	84,074	65,790	210,923	196,731
Operating segments | Other RV-related | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	83,476	65,044	262,586	224,550
Corporate and eliminations
Disaggregation of Revenue [Line Items]
Net sales	106,960	45,632	262,381	176,943
Intercompany eliminations
Disaggregation of Revenue [Line Items]
Net sales	$ (43,431)	$ (16,668)	$ (105,730)	$ (60,547)