Other Gains (Losses), Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Component Of Other Expense Income Nonoperating [Line Items]
Realized and unrealized gains (losses) from foreign currency exposures and settled transactions	$ (1,100)		$ (200)
Foreign currency exchange gains (losses)	137	$ (84)	(616)	$ 2,346
Non-cash gains (losses) in trading securities	1,860	3,227	(6,488)	5,328
Americas
Component Of Other Expense Income Nonoperating [Line Items]
Realized and unrealized gains (losses) from foreign currency exposures and settled transactions		100		500
Asia
Component Of Other Expense Income Nonoperating [Line Items]
Realized and unrealized gains (losses) from foreign currency exposures and settled transactions	500	500	(500)	400
Europe
Component Of Other Expense Income Nonoperating [Line Items]
Realized and unrealized gains (losses) from foreign currency exposures and settled transactions	500	(400)		1,600
e-Business Services
Component Of Other Expense Income Nonoperating [Line Items]
Realized and unrealized gains (losses) from foreign currency exposures and settled transactions	100	(300)	100	(200)
Foreign Exchange Contract
Component Of Other Expense Income Nonoperating [Line Items]
Foreign currency exchange gains (losses)	$ 200	$ 500	$ 100	$ (600)