Other Gains (Losses), Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2016	Jan. 31, 2015
Component Of Other Expense Income Nonoperating [Line Items]
Realized and unrealized gains (losses) from foreign currency exposures and settled transactions	$ 400		$ 800
Foreign currency exchange gains (losses)	(179)	$ 1,726	(753)	$ 2,430
Non-cash gains (losses) in trading securities	1,115	(412)	(8,348)	2,100
Americas
Component Of Other Expense Income Nonoperating [Line Items]
Realized and unrealized gains (losses) from foreign currency exposures and settled transactions		300		400
Asia
Component Of Other Expense Income Nonoperating [Line Items]
Realized and unrealized gains (losses) from foreign currency exposures and settled transactions	(400)		(1,100)
Europe
Component Of Other Expense Income Nonoperating [Line Items]
Realized and unrealized gains (losses) from foreign currency exposures and settled transactions	(200)	1,100	(500)	2,100
e-Business Services
Component Of Other Expense Income Nonoperating [Line Items]
Realized and unrealized gains (losses) from foreign currency exposures and settled transactions		300
Foreign Exchange Contract
Component Of Other Expense Income Nonoperating [Line Items]
Foreign currency exchange gains (losses)	$ (400)	$ (800)	$ (100)	$ (1,100)