Revenue Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 2,537,360	$ 2,158,785
Operating segments | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	2,488,387	2,109,784
Operating segments | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	1,885,899	1,616,777
Operating segments | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	602,488	493,007
Operating segments | Travel Trailers and Other | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	837,900	709,665
Operating segments | Fifth Wheels | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	554,144	491,223
Operating segments | North American Towables | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	1,392,044	1,200,888
Operating segments | Class A | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	158,555	161,732
Operating segments | Class C | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	275,399	229,837
Operating segments | Class B | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	59,901	24,320
Operating segments | North American Motorized | North America | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	493,855	415,889
Operating segments | Motorcaravan | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	318,343	281,733
Operating segments | Campervan | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	143,400	77,597
Operating segments | Caravan | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	55,195	61,032
Operating segments | Other RV-related | Europe | Recreational vehicles
Disaggregation of Revenue [Line Items]
Net sales	85,550	72,645
Corporate and eliminations
Disaggregation of Revenue [Line Items]
Net sales	80,707	73,566
Intercompany eliminations
Disaggregation of Revenue [Line Items]
Net sales	$ (31,734)	$ (24,565)