Derivatives and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2011	Jul. 31, 2011
Designated as Hedging Instrument [Member]
Fair values of derivative instruments in Consolidated Balance Sheets
Derivative asset designated as hedging instrument, fair value	$ 296	$ 16
Derivative liability designated as hedging instrument, fair value	108,969	114,110
Nondesignated [Member]
Fair values of derivative instruments in Consolidated Balance Sheets
Derivative asset designated as hedging instrument, fair value	21	3
Derivative liability designated as hedging instrument, fair value	1	2
Prepaid expenses and other current assets [Member] | Net Investment Hedging [Member] | Designated as Hedging Instrument [Member]
Fair values of derivative instruments in Consolidated Balance Sheets
Derivative asset designated as hedging instrument, fair value	0	0
Other Current Liabilities [Member] | Net Investment Hedging [Member] | Designated as Hedging Instrument [Member]
Fair values of derivative instruments in Consolidated Balance Sheets
Derivative liability designated as hedging instrument, fair value	2,656	5,295
Foreign Exchange Contract [Member] | Prepaid expenses and other current assets [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Fair values of derivative instruments in Consolidated Balance Sheets
Derivative asset designated as hedging instrument, fair value	296	16
Foreign Exchange Contract [Member] | Prepaid expenses and other current assets [Member] | Cash Flow Hedging [Member] | Nondesignated [Member]
Fair values of derivative instruments in Consolidated Balance Sheets
Derivative asset designated as hedging instrument, fair value	21	3
Foreign Exchange Contract [Member] | Other Current Liabilities [Member] | Designated as Hedging Instrument [Member]
Fair values of derivative instruments in Consolidated Balance Sheets
Derivative liability designated as hedging instrument, fair value	2,656	5,295
Foreign Exchange Contract [Member] | Other Current Liabilities [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Fair values of derivative instruments in Consolidated Balance Sheets
Derivative liability designated as hedging instrument, fair value	188	830
Foreign Exchange Contract [Member] | Other Current Liabilities [Member] | Cash Flow Hedging [Member] | Nondesignated [Member]
Fair values of derivative instruments in Consolidated Balance Sheets
Derivative liability designated as hedging instrument, fair value	1	2
Foreign Currency Denominated Debt [Member] | Prepaid expenses and other current assets [Member] | Designated as Hedging Instrument [Member]
Fair values of derivative instruments in Consolidated Balance Sheets
Derivative asset designated as hedging instrument, fair value	0	0
Foreign Currency Denominated Debt [Member] | Long Term Obligations Less Current Maturities [Member] | Designated as Hedging Instrument [Member]
Fair values of derivative instruments in Consolidated Balance Sheets
Derivative liability designated as hedging instrument, fair value	$ 106,125	$ 107,985