Stock-Based Compensation (Schedule Of Stock-Based Compensation Expense Included In Consolidated Statement Of Earnings) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income Tax Benefit	$ (1,340)	$ (349)	$ (4,177)	$ (1,391)
Net Stock-Based Compensation Expense	2,697	2,524	8,714	9,801
Cost Of Educational Services [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation Expense	1,292	919	4,125	3,581
Student Services And Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation Expense	$ 2,745	$ 1,954	$ 8,766	$ 7,611