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Total Stock-Based Compensation Expense Included in Consolidated Statement of Earnings (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-Based Compensation Expense $ 3,812 $ 3,720 $ 13,672 $ 12,090
Income Tax Benefit (1,313) (1,281) (4,651) (3,976)
Net Stock-Based Compensation Expense 2,499 2,439 9,021 8,114
Cost Of Educational Services
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-Based Compensation Expense 1,220 1,190 4,375 3,869
Student Services And Administrative Expense
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-Based Compensation Expense $ 2,592 $ 2,530 $ 9,297 $ 8,221