Segment Information - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015 Segment	Apr. 30, 2014	Jul. 31, 2014
Segment Reporting Information [Line Items]
Number of operating segments			4
Number of reportable segments			3
Total assets	$ 475,575		$ 475,575		$ 451,646
Net revenue	106,234	173,274	441,988	558,700
United States
Segment Reporting Information [Line Items]
Total assets	13,700		13,700		19,300
Net revenue	33,600	73,400	169,900	229,900
Ireland
Segment Reporting Information [Line Items]
Total assets	3,800		3,800		4,700
China
Segment Reporting Information [Line Items]
Net revenue	28,200	30,300	100,300	98,500
Netherlands
Segment Reporting Information [Line Items]
Total assets	4,000		4,000		3,600
Net revenue	12,700	24,000	52,600	78,100
Czech Republic
Segment Reporting Information [Line Items]
Net revenue	$ 16,600	$ 20,700	$ 65,400	$ 73,700