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Income Taxes (Reconciliation of Income Tax Expense Using the Statutory Rate and Actual Income Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Reconciliation of income tax expense using the statutory rate and actual income tax expense is as follows:
Income taxes at the U.S. federal statutory rate	$ 174,968	$ 164,830	$ 137,434
State and local income taxes, net of federal benefit	12,192	11,876	11,984
Other	(2,694)	(3,399)	(3,738)
Income taxes	$ 184,466	$ 173,307	$ 145,680

- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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- Definition

The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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