Derivatives and Hedging Activities - Additional Information (Detail)	12 Months Ended											12 Months Ended
	Jul. 31, 2013 USD ($)	Jul. 31, 2012 USD ($)	Jul. 31, 2011 USD ($)	Jul. 31, 2012 EUR (€)	Jul. 31, 2010 USD ($)	Jul. 31, 2013 GBP-denominated interco debt [Member] GBP (£)	Oct. 31, 2012 GBP-denominated interco debt [Member] GBP (£)	Jul. 31, 2012 Euro-denominated interco debt [Member] EUR (€)	Jul. 31, 2013 Senior Unsecured Notes [Member] EUR (€)	May 13, 2010 Senior Unsecured Notes [Member] USD ($)	May 13, 2010 Senior Unsecured Notes [Member] EUR (€)	Jul. 31, 2013 Intercompany loans [Member] USD ($)	Jul. 31, 2012 Intercompany loans [Member] USD ($)	Jul. 31, 2013 Euro-denominated debt [Member] USD ($)	Jul. 31, 2012 Euro-denominated debt [Member] USD ($)	Jul. 31, 2011 Euro-denominated debt [Member] USD ($)	Jul. 31, 2013 Designated as hedging instruments [Member] USD ($)	Jul. 31, 2012 Designated as hedging instruments [Member] USD ($)	Jul. 31, 2013 Cash Flow Hedging [Member] Other current liabilities [Member] Designated as hedging instruments [Member] Foreign exchange contract [Member] USD ($)	Jul. 31, 2012 Cash Flow Hedging [Member] Other current liabilities [Member] Designated as hedging instruments [Member] Foreign exchange contract [Member] USD ($)	Jul. 31, 2013 Cash Flow Hedging [Member] Prepaid expenses and other current assets [Member] Designated as hedging instruments [Member] Foreign exchange contract [Member] USD ($)	Jul. 31, 2012 Cash Flow Hedging [Member] Prepaid expenses and other current assets [Member] Designated as hedging instruments [Member] Foreign exchange contract [Member] USD ($)
Derivatives, Fair Value [Line Items]
Derivative maturity	18 months
Notional amount of outstanding forward exchange contracts	$ 157,500,000	$ 61,169,000
Unrealized losses on foreign currency cash flow hedges expected to be reclassified to earnings within the next twelve months	118,000	1,348,000
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer	2 months
Reclassification adjustment for (gains) losses included in net income	578,000	(494,000)	(1,793,000)
Total outstanding forward foreign exchange contracts		39,458,000
Net investment hedges to hedge portions of net investment				4,581,000		25,000,000.0	25,000,000	4,600,000	75,000,000.0	75,000,000.0	75,000,000
Accumulated other comprehensive income	56,063,000	59,411,000	113,898,000		50,905,000									4,835	2,635
Outstanding forward foreign exchange contracts	4,500,000	10,650,000
Foreign exchange contracts	(150,000)	1,041,000										2,121	547	7,470,000	15,705	10,238
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	1,594,000	188,000
Derivative Liability, Fair Value, Gross Liability																	99,750,000	99,362,000	0	210,000
Asset Derivatives																	$ 7,000	$ 1,156,000			$ 0	$ 1,156,000