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Income Taxes (Components of Income Tax Expense) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Current:      
Federal $ 163,140 $ 109,964 $ 139,251
State and local 21,328 12,478 17,780
Current income tax expense 184,468 122,442 157,031
Deferred 48,948 62,024 16,276
Income taxes $ 233,416 $ 184,466 $ 173,307