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Credit Arrangements Credit Arrangements (Scheduled Maturities of Long-term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2013
Aug. 31, 2012
Long-term Debt, Fiscal Year Maturity [Abstract]    
2014 $ 5,228 $ 4,252
2015 4,948  
2016 3,496  
2017 402,969  
2018 502,195  
Thereafter 330,758  
Total excluding deferred gain of interest rate swaps 1,249,594  
Deferred gain of interest rate swaps 34,448 46,900
Total long-term debt including current maturities $ 1,284,042 $ 1,161,325