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Share- Based Compensation (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Expense    
Share-based compensation expense included in operating expenses $ 3,716 $ 3,130
Tax effect of share-based compensation    
Tax effect of share-based compensation (1,486) (1,252)
Share-based compensation expense, net of tax 2,230 1,878
Instructional Costs and Services [Member]
   
Share-based Compensation Expense    
Share-based compensation expense included in operating expenses 1,829 1,409
Selling and Promotional [Member]
   
Share-based Compensation Expense    
Share-based compensation expense included in operating expenses 171 149
General and Administrative [Member]
   
Share-based Compensation Expense    
Share-based compensation expense included in operating expenses $ 1,716 $ 1,572