Revenue Recognition - Schedule of Disaggregates of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 1,755,976	$ 2,231,668
Operating Segments | Travel Trailers And Other Towables
Disaggregation of Revenue [Line Items]
Net sales	761,484	993,604
Operating Segments | Fifth Wheels Towables
Disaggregation of Revenue [Line Items]
Net sales	517,614	624,897
Operating Segments | Towables
Disaggregation of Revenue [Line Items]
Net sales	1,279,098	1,618,501
Operating Segments | Class A Motorized
Disaggregation of Revenue [Line Items]
Net sales	227,274	252,423
Operating Segments | Class C Motorized
Disaggregation of Revenue [Line Items]
Net sales	184,384	286,666
Operating Segments | Class B Motorized
Disaggregation of Revenue [Line Items]
Net sales	19,540	27,522
Operating Segments | Motorized
Disaggregation of Revenue [Line Items]
Net sales	431,198	566,611
Corporate and Eliminations
Disaggregation of Revenue [Line Items]
Net sales	73,848	82,919
Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net sales	$ (28,168)	$ (36,363)