Summary of Significant Accounting Policies Foreign Currency Hedging (Details)	12 Months Ended
	Jul. 31, 2013 USD ($)	Jul. 31, 2012 USD ($)	Jul. 31, 2012 EUR (€)	Jul. 31, 2013 Senior Unsecured Notes [Member] EUR (€)	May 13, 2010 Senior Unsecured Notes [Member] USD ($)	May 13, 2010 Senior Unsecured Notes [Member] EUR (€)	Jul. 31, 2013 GBP-denominated interco debt [Member] GBP (£)	Oct. 31, 2012 GBP-denominated interco debt [Member] GBP (£)	Jul. 31, 2013 Euro-denominated interco debt [Member] EUR (€)	Jul. 31, 2012 Euro-denominated interco debt [Member] EUR (€)
Derivative [Line Items]
Derivative maturity	18 months
Foreign Currency Contracts, Liability, Fair Value Disclosure	$ 596,000
Foreign Currency Contract, Asset, Fair Value Disclosure		953,000
Notional Amount of Foreign Currency Derivatives	157,500,000	61,169,000
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	118,000	1,348,000
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(150,000)	1,041,000
Debt face amount			4,581,000	75,000,000.0	75,000,000.0	75,000,000	25,000,000.0	25,000,000		4,600,000
Translation Adjustment For Net Investment Hedge Euro Denominated Debt Increase Decrease									2,715,000	2,635,000
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	603,000
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value		$ 78,000