Derivatives and Hedging Activities - Additional Information (Detail)	12 Months Ended							12 Months Ended						12 Months Ended			12 Months Ended					12 Months Ended
	Jul. 31, 2014 USD ($)	Jul. 31, 2013 USD ($)	Jul. 31, 2012 USD ($)	Jul. 31, 2011 USD ($)	May 13, 2010 Senior Unsecured Notes [Member] USD ($)	Jul. 31, 2014 Foreign exchange contract [Member] USD ($)	Jul. 31, 2013 Foreign exchange contract [Member] USD ($)	Jul. 31, 2014 Not designated as hedging Instruments [Member] USD ($)	Jul. 31, 2013 Not designated as hedging Instruments [Member] USD ($)	Jul. 31, 2014 Net investment hedging [Member] USD ($)	Jul. 31, 2013 Net investment hedging [Member] USD ($)	Jul. 31, 2014 Designated as hedging instruments [Member] USD ($)	Jul. 31, 2013 Designated as hedging instruments [Member] USD ($)	Jul. 31, 2014 Designated as hedging instruments [Member] Net investment hedging [Member] GBP-denominated interco debt [Member] USD ($)	Jul. 31, 2013 Designated as hedging instruments [Member] Net investment hedging [Member] GBP-denominated interco debt [Member] USD ($)	Jul. 31, 2014 Designated as hedging instruments [Member] Net investment hedging [Member] GBP-denominated interco debt [Member] GBP (£)	Jul. 31, 2014 Designated as hedging instruments [Member] Net investment hedging [Member] EUR denominated unsecured debt [Domain] USD ($)	Jul. 31, 2013 Designated as hedging instruments [Member] Net investment hedging [Member] EUR denominated unsecured debt [Domain] USD ($)	Jul. 31, 2012 Designated as hedging instruments [Member] Net investment hedging [Member] EUR denominated unsecured debt [Domain] USD ($)	Jul. 31, 2013 Designated as hedging instruments [Member] Net investment hedging [Member] EUR denominated unsecured debt [Domain] EUR (€)	May 13, 2010 Designated as hedging instruments [Member] Net investment hedging [Member] EUR denominated unsecured debt [Domain] EUR (€)	Jul. 31, 2014 Designated as hedging instruments [Member] Cash Flow Hedging [Member] USD ($)	Jul. 31, 2013 Designated as hedging instruments [Member] Cash Flow Hedging [Member] USD ($)	Jul. 31, 2012 Designated as hedging instruments [Member] Cash Flow Hedging [Member] USD ($)	Jul. 31, 2014 Other current liabilities [Member] Not designated as hedging Instruments [Member] Foreign exchange contract [Member] USD ($)	Jul. 31, 2013 Other current liabilities [Member] Not designated as hedging Instruments [Member] Foreign exchange contract [Member] USD ($)	Jul. 31, 2014 Prepaid expenses and other current assets [Member] Not designated as hedging Instruments [Member] Foreign exchange contract [Member] USD ($)	Jul. 31, 2013 Prepaid expenses and other current assets [Member] Not designated as hedging Instruments [Member] Foreign exchange contract [Member] USD ($)
Derivatives, Fair Value [Line Items]
Derivative maturity	18 months
Unrealized losses on foreign currency cash flow hedges expected to be reclassified to earnings within the next twelve months																						$ 21,000	$ 118,000
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer																						12 months
Reclassification adjustment for (gains) losses included in net income	(147,000)	(578,000)	494,000																			(147,000)	(578,000)	494,000
Net investment hedges to hedge portions of net investment					75,000,000.0											25,000,000				(4,835,000)	75,000,000
Derivative, Notional Amount						104,000,000	157,500,000			5,300,000	4,500,000
Accumulated other comprehensive income	64,156,000	56,063,000	59,411,000	113,898,000													(5,495,000)
Foreign exchange contracts										265,000	(150,000)			2,271,000	2,121,000		(660,000)	(7,470,000)	15,705,000
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments								1,147,000	(1,594,000)
Derivative Liability, Fair Value, Gross Liability								375,000	890,000			100,424,000	99,750,000												375,000	890,000
Asset Derivatives								$ 166,000	$ 287,000			$ 0	$ 7,000														$ 166,000	$ 287,000