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Derivatives and Hedging Activities - Additional Information (Detail) € in Thousands, $ in Thousands	12 Months Ended
	Jul. 31, 2017 USD ($)	Jul. 31, 2016 USD ($)	Jul. 31, 2015 USD ($)	Jul. 31, 2016 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	$ 486	$ 196	$ (1,325)
Accumulated other comprehensive (loss) income	(44,682)	(54,745)	(45,034)
Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 81,195	186,093
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	$ 30,016	34,540
Not designated as hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	2,508	2,162
Derivative Liability, Fair Value, Gross Liability	7	68
Asset Derivatives	287	1,873
Designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	54,849	117,558
Asset Derivatives	1,067	265
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	9,348			€ 11,140
Foreign exchange contracts	1,792	1,372	18,008
Designated as hedging instruments [Member] \| Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Reclassification adjustment for (gains) losses included in net income	(486)	(199)	$ (1,325)
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	(500)	761
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	7	68
Prepaid expenses and other current assets [Member] \| Not designated as hedging Instruments [Member] \| Foreign exchange contract [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	287	1,873
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	1,569	670
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	$ 1,067	$ 265