Inventories - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Inventory [Line Items]
Inventory	$ 434,004	$ 276,515
Subsidiaries valued inventory in last-in, first-out method	219,050	204,017
Subsidiaries valued inventory in first-in, first-out method	214,954	72,498
Increase in inventory during the period	15,582	(14,750)	$ 44,774
Inventory obsolescence reserve	4,840	$ 3,638
FIFO inventory
Inventory [Line Items]
Increase in inventory during the period	142,456
Jayco, Inc. | FIFO inventory
Inventory [Line Items]
Increase in inventory during the period	$ 138,292