Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 2,727,788	$ 2,003,133	$ 5,265,148	$ 4,161,918
Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	2,683,639	1,964,702
Operating segments | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	2,683,639	1,964,702	5,172,026	4,074,486
Operating segments | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	1,950,176	1,327,587	3,836,075	2,944,364
Operating segments | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	733,463	637,115	1,335,951	1,130,122
Operating segments | Travel Trailers | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	831,359	583,121	1,669,259	1,292,786
Operating segments | Fifth Wheels | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	541,822	400,786	1,095,966	892,009
Operating segments | North American Towables | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	1,373,181	983,907	2,765,225	2,184,795
Operating segments | Class A | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	222,128	125,474	380,683	287,206
Operating segments | Class C | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	294,300	186,761	569,699	416,598
Operating segments | Class B | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	60,567	31,445	120,468	55,765
Operating segments | North American Motorized | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	576,995	343,680	1,070,850	759,569
Operating segments | Motorcaravan | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	419,137	382,422	737,480	664,155
Operating segments | Campervan | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	149,112	97,923	292,512	175,520
Operating segments | Caravan | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	71,654	69,909	126,849	130,941
Operating segments | Other RV-related | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	93,560	86,861	179,110	159,506
Corporate and eliminations
Disaggregation of Revenue [Line Items]
Net sales	74,714	57,745	155,421	131,311
Intercompany eliminations
Disaggregation of Revenue [Line Items]
Net sales	$ (30,565)	$ (19,314)	$ (62,299)	$ (43,879)