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Net Restructuring Charges (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended						9 Months Ended
	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Apr. 30, 2015	Apr. 30, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring, net	$ 1,994us-gaap_RestructuringCharges	$ 1,000us-gaap_RestructuringCharges	$ 1,900us-gaap_RestructuringCharges	$ 3,468us-gaap_RestructuringCharges	$ 1,000us-gaap_RestructuringCharges	$ 900us-gaap_RestructuringCharges	$ 4,936us-gaap_RestructuringCharges	$ 5,440us-gaap_RestructuringCharges
Cost of revenue
Restructuring Cost and Reserve [Line Items]
Restructuring, net	1,873			2,207			4,524	3,580
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring, net	$ 121			$ 1,261			$ 412	$ 1,860

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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