Income Taxes Income tax expense consists of the following components (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2012	May 31, 2011	May 31, 2010
Current:
Federal	$ 139,251	$ 70,811	$ 106,389
State and local	17,780	15,063	12,909
Current income tax expense	157,031	85,874	119,298
Deferred	16,276	59,806	8,974
Income taxes	$ 173,307	$ 145,680	$ 128,272