Derivatives and Hedging Activities - Fair Values of Derivative Instruments in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Jul. 31, 2015
Designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 327	$ 518
Liability Derivatives	122,373	122,251
Designated as hedging instruments [Member] | Cash flow hedging | Foreign exchange contract [Member] | Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	327	518
Designated as hedging instruments [Member] | Cash flow hedging | Foreign exchange contract [Member] | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	668	737
Designated as hedging instruments [Member] | Net investment hedging [Member] | Foreign currency denominated debt [Member] | Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	0
Designated as hedging instruments [Member] | Net investment hedging [Member] | Foreign currency denominated debt [Member] | Long term obligations less current maturities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	121,705	121,514
Not designated as hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	528	168
Liability Derivatives	134	543
Not designated as hedging Instruments [Member] | Foreign exchange contract [Member] | Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	528	168
Not designated as hedging Instruments [Member] | Foreign exchange contract [Member] | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 134	$ 543