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Credit Arrangements Credit Arrangements (Scheduled Maturities of Long-term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2012
Aug. 31, 2011
Long-term Debt, Fiscal Year Maturity [Abstract]    
2013 $ 4,252 $ 58,908
2014 203,437  
2015 3,074  
2016 1,613  
2017 401,104  
Thereafter 500,927  
Total excluding deferred gain of interest rate swaps 1,114,407  
Deferred gain on termination of interest rate swaps 46,918  
Total long-term debt including current maturities $ 1,161,325 $ 1,226,405