Total Stock-Based Compensation Expense Included in Consolidated Statement of Earnings (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income Tax Benefit	$ (1,392)	$ (848)	$ (3,338)	$ (2,695)
Net Stock-Based Compensation Expense	2,652	1,806	6,522	5,675
Cost Of Educational Services
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation Expense	1,294	849	3,155	2,679
Student Services And Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based Compensation Expense	$ 2,750	$ 1,805	$ 6,705	$ 5,691