Derivatives and Hedging Activities - Fair Values of Derivative Instruments in Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2014	Jul. 31, 2014
Designated as hedging instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Asset Derivatives	$ 568	$ 0
Liability Derivatives	94,590	100,424
Not designated as hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Asset Derivatives	100	166
Liability Derivatives	333	375
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	100	166
Other current liabilities [Member] | Foreign exchange contract [Member] | Not designated as hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Liability Derivatives	333	375
Cash flow hedging | Prepaid expenses and other current assets [Member] | Foreign exchange contract [Member] | Designated as hedging instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Asset Derivatives	544	0
Cash flow hedging | Other current liabilities [Member] | Foreign exchange contract [Member] | Designated as hedging instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Liability Derivatives	0	0
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	24	0
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	0	14
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	$ 94,590	$ 100,410