Restructuring, Net - Additional Information (Detail) $ in Thousands	3 Months Ended						9 Months Ended
	Apr. 30, 2016 USD ($) Employee	Jan. 31, 2016 USD ($)	Oct. 31, 2015 USD ($) Employee	Apr. 30, 2015 USD ($) Employee	Jan. 31, 2015 USD ($) Employee	Oct. 31, 2014 USD ($) Employee	Apr. 30, 2016 USD ($)	Apr. 30, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring, net	$ 182	$ 200	$ 1,000	$ 1,994	$ 1,000	$ 1,900	$ 1,429	$ 4,936
Number of workforce reduction | Employee	17		55	63	72	93
Employee Related Expenses | Americas
Restructuring Cost and Reserve [Line Items]
Restructuring, net			$ 800		$ 400	$ 400
Employee Related Expenses | Europe
Restructuring Cost and Reserve [Line Items]
Restructuring, net				$ 1,700	500	1,000
Employee Related Expenses | Asia
Restructuring Cost and Reserve [Line Items]
Restructuring, net	$ 200		$ 300	$ 300	$ 100	$ 500
Contractual Charges | Americas
Restructuring Cost and Reserve [Line Items]
Restructuring, net		100
Contractual Charges | Europe
Restructuring Cost and Reserve [Line Items]
Restructuring, net		$ 100