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Credit Facility (Details Textuals) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jan. 31, 2012
Line of Credit Facility [Abstract]  
Issuance Date December 2010
Maturity Date Dec. 14, 2015
Debt Instrument, Interest Rate, Effective Percentage [Abstract]  
Reference Rate Basis Eurocurrency Rate
Reference Rate 0.26%
Applicable interest rate addition to Eurocurrency Rate at the end of the period 1.75%
Revolving Credit Facility
 
Line of Credit Facility [Abstract]  
Maximum Borrowing capacity 100.0
Minimum range of commitment fee percentage 0.075%
Maximum range of commitment fee percentage 0.125%
Outstanding borrowings under the Revolving Credit   
Alternative Currency Borrowing Credit Facility
 
Line of Credit Facility [Abstract]  
Maximum Borrowing capacity 100.0
Letter of Credit
 
Line of Credit Facility [Abstract]  
Maximum Borrowing capacity 50.0
Amended Term Loan Facility
 
Line of Credit Facility [Abstract]  
Maximum Borrowing capacity 500.0
Original Term Loan facility
 
Line of Credit Facility [Abstract]  
Term Loan 481.3
Quarterly payments for term loan 18.8
Frequency of payments for term loan Quarterly