Property and Equipment - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 13,179	$ 14,118	$ 13,920
Impairment of long-lived assets	500		1,128
Americas
Property, Plant and Equipment [Line Items]
Depreciation expense	3,400	4,000	4,300
Asia
Property, Plant and Equipment [Line Items]
Depreciation expense	4,800	4,800	4,400
Europe
Property, Plant and Equipment [Line Items]
Depreciation expense	4,200	4,600	4,500
All Other
Property, Plant and Equipment [Line Items]
Depreciation expense	800	700	800
Kildare
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets	$ 500