Derivatives and Hedging Activities - Fair Values of Derivative Instruments in Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013
Designated as hedging instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Asset Derivatives	$ 0	$ 7
Liability Derivatives	100,424	99,750
Not designated as hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Asset Derivatives	166	287
Liability Derivatives	375	890
Prepaid expenses and other current assets [Member] | Foreign exchange contract [Member] | Not designated as hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Asset Derivatives	166	287
Other current liabilities [Member] | Foreign exchange contract [Member] | Not designated as hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Liability Derivatives	375	890
Net investment hedging [Member] | Prepaid expenses and other current assets [Member] | Foreign exchange contract [Member] | Designated as hedging instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Asset Derivatives	0	7
Net investment hedging [Member] | Prepaid expenses and other current assets [Member] | Foreign currency denominated debt [Member] | Designated as hedging instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Asset Derivatives	0	0
Net investment hedging [Member] | Other current liabilities [Member] | Foreign exchange contract [Member] | Designated as hedging instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Liability Derivatives	14	0
Net investment hedging [Member] | Long term obligations less current maturities [Member] | Foreign currency denominated debt [Member] | Designated as hedging instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Liability Derivatives	$ 100,410	$ 99,750