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Long-Term Debt (Details) (USD $)
12 Months Ended
Jul. 31, 2011
Jan. 14, 2011
Debt Disclosure [Abstract]  
Issuance DateDecember 14, 2010 
Maximum Borrwing capacity$ 100,000,000 
Foreign currency borrowing sublimit100,000,000 
Letter of credit sublimit50,000,000 
Term Loan facility 400,000,000
Quarterly payments for term loan matures12,500,000 
Principal repayments of Term Loan25,000,000 
Outstanding Term Loan balance375,100,000 
Deferred financing costs1,800,000 
Reference Rate BasisEurocurrency Rate 
Additional interest rate in case of default2.00% 
Applicable interest rate addition to Eurocurrency Rate1.50% 
Eurocurrency Rate at the end of the period1.69% 
Minimum Range Of Commitment Fee Percentage0.075% 
Maximum Range Of Commitment Fee Percentage0.125% 
201250,139,000 
201350,000,000 
201450,000,000 
201550,000,000 
2016175,000,000 
Long-term Debt$ 375,139,000