Segment Information - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2017 USD ($)	Jan. 31, 2016 USD ($)	Jan. 31, 2017 USD ($) Segment	Jan. 31, 2016 USD ($) Segment	Jul. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Segment			4
Number of reportable segments | Segment			4	3
Total assets	$ 312,198		$ 312,198		$ 347,932
Net revenue	117,568	$ 119,966	238,895	$ 261,055
United States
Segment Reporting Information [Line Items]
Total assets	11,500		11,500		12,300
Net revenue	27,500	30,100	54,300	65,100
Ireland
Segment Reporting Information [Line Items]
Total assets	3,300		3,300		3,500
China
Segment Reporting Information [Line Items]
Total assets	2,500		2,500		3,000
Net revenue	31,900	37,500	68,100	83,800
Netherlands
Segment Reporting Information [Line Items]
Total assets	3,200		3,200		3,000
Net revenue	20,000	16,900	36,800	37,600
Singapore
Segment Reporting Information [Line Items]
Total assets	2,800		2,800		$ 2,900
Czech Republic
Segment Reporting Information [Line Items]
Net revenue	$ 21,700	$ 18,700	$ 48,000	$ 41,000