Other Noncurrent Assets (Details) (USD $) In Thousands, unless otherwise specified	May 31, 2012	May 31, 2011
Other Noncurrent Assets
Capitalized program development costs	$ 91,942	$ 69,413
Costs in excess of billings	27,872	19,404
Notes receivable	18,869	2,443
Assets under deferred compensation plan	16,315	16,421
Cash surrender value of life insurance	15,632	15,164
Licenses fees	15,072
Debt issuance costs	10,025	5,281
Other	13,185	14,012
Other Noncurrent Assets	$ 208,912	$ 142,138