Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Derivatives and Hedging Activities - Additional Information (Detail) € in Thousands, $ in Thousands	12 Months Ended
	Jul. 31, 2018 USD ($)	Jul. 31, 2017 USD ($)	Jul. 31, 2016 USD ($)	Jul. 31, 2017 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	$ 551	$ 486	$ 196
Accumulated other comprehensive (loss) income	(56,401)	(44,682)	(54,745)
Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 32,667	81,195
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	$ 27,150	30,016
Not designated as hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	24	(2,508)
Derivative Liability, Fair Value, Gross Liability	3	7
Asset Derivatives	1	287
Designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	52,668	54,849
Asset Derivatives	1,076	1,067
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	9,961			€ 9,348
Foreign exchange contracts	612	1,792	1,372
Designated as hedging instruments [Member] \| Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Reclassification adjustment for (gains) losses included in net income	(551)	(486)	$ (199)
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	(1,017)	500
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	3	7
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	287
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	0	1,569
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	$ 1,076	$ 1,067