Derivatives and Hedging Activities (Details Textual)	12 Months Ended
	Jul. 31, 2012 EUR (€)	Jul. 31, 2012 USD ($)	Jul. 31, 2011 USD ($)	Jul. 31, 2012 Designated as Hedging Instrument [Member] USD ($)	Jul. 31, 2011 Designated as Hedging Instrument [Member] USD ($)	Jul. 31, 2012 Nondesignated [Member] USD ($)	Jul. 31, 2011 Nondesignated [Member] USD ($)	Jul. 31, 2012 Foreign Exchange Contract [Member] Other Current Liabilities [Member] Designated as Hedging Instrument [Member] USD ($)	Jul. 31, 2011 Foreign Exchange Contract [Member] Other Current Liabilities [Member] Designated as Hedging Instrument [Member] USD ($)	Jul. 31, 2012 Foreign Exchange Contract [Member] Cash Flow Hedging [Member] Designated as Hedging Instrument [Member] USD ($)	Jul. 31, 2012 Foreign Exchange Contract [Member] Cash Flow Hedging [Member] Other Current Liabilities [Member] Designated as Hedging Instrument [Member] USD ($)	Jul. 31, 2011 Foreign Exchange Contract [Member] Cash Flow Hedging [Member] Other Current Liabilities [Member] Designated as Hedging Instrument [Member] USD ($)	Jul. 31, 2012 Foreign Exchange Contract [Member] Cash Flow Hedging [Member] Other Current Liabilities [Member] Nondesignated [Member] USD ($)	Jul. 31, 2011 Foreign Exchange Contract [Member] Cash Flow Hedging [Member] Other Current Liabilities [Member] Nondesignated [Member] USD ($)	Jul. 31, 2012 Foreign Exchange Contract [Member] Cash Flow Hedging [Member] Prepaid expenses and other current assets [Member] Designated as Hedging Instrument [Member] USD ($)	Jul. 31, 2011 Foreign Exchange Contract [Member] Cash Flow Hedging [Member] Prepaid expenses and other current assets [Member] Designated as Hedging Instrument [Member] USD ($)	Jul. 31, 2012 Foreign Exchange Contract [Member] Cash Flow Hedging [Member] Prepaid expenses and other current assets [Member] Nondesignated [Member] USD ($)	Jul. 31, 2011 Foreign Exchange Contract [Member] Cash Flow Hedging [Member] Prepaid expenses and other current assets [Member] Nondesignated [Member] USD ($)	Jul. 31, 2012 Senior Unsecured Notes [Member] EUR (€)	May 13, 2010 Senior Unsecured Notes [Member] EUR (€)
Debt Instrument [Line Items]
Private Placement in Euros/Dollars																			€ 75,000,000	€ 75,000,000
Additional Derivatives and Hedging Activities (Textual) [Abstract]
Derivative asset designated as hedging instrument, fair value				1,156,000	16,000	78,000	3,000			1,156,000					1,156,000	16,000	78,000	3,000
Derivative liability designated as hedging instrument, fair value				99,362,000	114,110,000		2,000	71,000	5,295,000		210,000	830,000		2,000
Derivatives and Hedging Activities (Textual) [Abstract]
Notional amount of outstanding forward exchange contracts		61,169,000	80,807,000
Unrealized losses on foreign currency cash flow hedges expected to be reclassified to earnings within the next twelve months		1,348,000	1,535,000
Outstanding forward foreign exchange contracts including certain specific contracts		39,458,000	30,519,000
Maturities of foreign currency contracts period	18 months or less
Intercompany loans designated as net investment hedges	4,581,000
Foreign denominated debt outstanding		$ 10,650,000	$ 50,000,000