Segment Information - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2014 Segment	Jul. 31, 2013	Jul. 31, 2012
Segment Reporting Information [Line Items]
Number of operating segments									5
Number of reportable segments									3
Total assets	$ 451,646				$ 343,696				$ 451,646	$ 343,696
Net revenue	164,700	173,274	194,011	191,415	181,001	173,016	203,436	197,051	723,400	754,504	713,947
United States
Segment Reporting Information [Line Items]
Total assets	19,300				21,800				19,300	21,800
Net revenue									297,300	277,400	282,100
Singapore
Segment Reporting Information [Line Items]
Total assets	4,400				5,200				4,400	5,200
Ireland
Segment Reporting Information [Line Items]
Total assets	4,700				5,000				4,700	5,000
China
Segment Reporting Information [Line Items]
Net revenue									131,300	147,300	141,900
Netherlands
Segment Reporting Information [Line Items]
Net revenue									101,900	91,800	106,500
Czech Republic
Segment Reporting Information [Line Items]
Net revenue									$ 91,900	$ 97,900	$ 60,400