Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 1,755,976	$ 2,231,668
Income (loss) from continuing operations before income taxes	31,517	187,091
Operating Segments | Towables
Segment Reporting Information [Line Items]
Net sales	1,279,098	1,618,501
Operating Segments | Motorized
Segment Reporting Information [Line Items]
Net sales	431,198	566,611
Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Net sales	1,710,296	2,185,112
Income (loss) from continuing operations before income taxes	96,262	196,437
Operating Segments | Recreational vehicles | Towables
Segment Reporting Information [Line Items]
Net sales	1,279,098	1,618,501
Income (loss) from continuing operations before income taxes	74,550	158,851
Operating Segments | Recreational vehicles | Motorized
Segment Reporting Information [Line Items]
Net sales	431,198	566,611
Income (loss) from continuing operations before income taxes	21,712	37,586
Corporate and Eliminations
Segment Reporting Information [Line Items]
Net sales	73,848	82,919
Income (loss) from continuing operations before income taxes	5,910	8,483
Intercompany Eliminations
Segment Reporting Information [Line Items]
Net sales	(28,168)	(36,363)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	$ (70,655)	$ (17,829)