Derivatives and Hedging Activities - Additional Information (Detail) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2014 USD ($)	Jan. 31, 2013 USD ($)	Jan. 31, 2014 USD ($)	Jan. 31, 2013 USD ($)	Jul. 31, 2013 USD ($)	Jan. 31, 2014 GBP-denominated interco debt [Member] GBP (£)	May 13, 2010 Senior Unsecured Notes [Member] USD ($)
Derivatives, Fair Value [Line Items]
Derivative maturity			18 months
Derivative, Notional Amount	$ 124,210		$ 124,210		$ 157,500
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			0	207
Reclassification adjustment for gains included in net earnings	2	90	92	557
Total outstanding forward foreign exchange contracts	14,249		14,249
Net investment hedges to hedge portions of net investment						25,036	75,000
Amount Outstanding Forward Foreign Exchange Contracts Net Investment Hedge	5,500		5,500
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax			280	367
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ 26	$ 42	$ 1,421	$ 228