Derivatives and Hedging Activities - Fair Values of Derivative Instruments in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Oct. 31, 2015	Jul. 31, 2015
Designated as hedging instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Asset Derivatives	$ 463	$ 518
Liability Derivatives	121,410	122,251
Not designated as hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Asset Derivatives	629	168
Liability Derivatives	1,265	543
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	629	168
Foreign exchange contract [Member] | Not designated as hedging Instruments [Member] | Other current liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Liability Derivatives	1,265	543
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	463	518
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	767	737
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	$ 120,643	$ 121,514