Derivatives and Hedging Activities - Fair Values of Derivative Instruments in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Oct. 31, 2016	Jul. 31, 2016
Designated as hedging instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Asset Derivatives	$ 507	$ 265
Liability Derivatives	113,385	117,558
Not designated as hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Asset Derivatives	1,132	1,873
Liability Derivatives	628	68
Foreign exchange contract [Member] | Not designated as hedging Instruments [Member] | Prepaid expenses and other current assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Asset Derivatives	1,132	1,873
Foreign exchange contract [Member] | Not designated as hedging Instruments [Member] | Other current liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Liability Derivatives	628	68
Cash Flow Hedging [Member] | Foreign exchange contract [Member] | Designated as hedging instruments [Member] | Prepaid expenses and other current assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Asset Derivatives	507	265
Cash Flow Hedging [Member] | Foreign exchange contract [Member] | Designated as hedging instruments [Member] | Other current liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Liability Derivatives	519	670
Net Investment Hedging [Member] | Foreign currency denominated debt [Member] | Designated as hedging instruments [Member] | Long term obligations less current maturities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Liability Derivatives	$ 112,866	$ 116,888