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Derivatives and Hedging Activities - Additional Information (Detail) € in Thousands, £ in Thousands, $ in Thousands	12 Months Ended
	Jul. 31, 2016 USD ($)	Jul. 31, 2015 USD ($)	Jul. 31, 2014 USD ($)	Jul. 31, 2016 GBP (£)	Jul. 31, 2015 EUR (€)	May 13, 2010 EUR (€)
Derivatives, Fair Value [Line Items]
Derivative maturity	18 months
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	$ 196	$ (1,325)	$ (147)
Accumulated other comprehensive (loss) income	(54,745)	(45,034)	64,156
Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 186,093	139,300
Foreign exchange contract [Member]
Derivatives, Fair Value [Line Items]
Derivative maturity	18 months
Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 34,540	33,223
Not designated as hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	2,162	1,705
Derivative Liability, Fair Value, Gross Liability	68	543
Asset Derivatives	1,873	168
Designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	117,558	122,251
Asset Derivatives	265	518
Designated as hedging instruments [Member] \| Net Investment Hedging [Member] \| GBP-denominated interco debt [Member]
Derivatives, Fair Value [Line Items]
Net investment hedges to hedge portions of net investment \| £				£ 25,000
Foreign exchange contracts	6,887	889
Designated as hedging instruments [Member] \| Net Investment Hedging [Member] \| EUR denominated unsecured debt [Domain]
Derivatives, Fair Value [Line Items]
Net investment hedges to hedge portions of net investment \| €						€ 75,000
Accumulated other comprehensive (loss) income	11,140				€ 12,512
Foreign exchange contracts	1,372	18,008	(660)
Designated as hedging instruments [Member] \| Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Reclassification adjustment for (gains) losses included in net income	(199)	(1,325)	$ (147)
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	(761)	297
Other current liabilities [Member] \| Not designated as hedging Instruments [Member] \| Foreign exchange contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	68	543
Prepaid expenses and other current assets [Member] \| Not designated as hedging Instruments [Member] \| Foreign exchange contract [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	1,873	168
Cash Flow Hedging [Member] \| Other current liabilities [Member] \| Designated as hedging instruments [Member] \| Foreign exchange contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	670	737
Cash Flow Hedging [Member] \| Prepaid expenses and other current assets [Member] \| Designated as hedging instruments [Member] \| Foreign exchange contract [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	265	518
Net Investment Hedging [Member] \| Other current liabilities [Member] \| Designated as hedging instruments [Member] \| Foreign exchange contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0	0
Net Investment Hedging [Member] \| Prepaid expenses and other current assets [Member] \| Designated as hedging instruments [Member] \| Foreign exchange contract [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 0	$ 0