Quarterly report pursuant to Section 13 or 15(d)

Employee Stock Plans (Components Of Stock-Based Compensation Expense Recognized) (Details)

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Employee Stock Plans (Components Of Stock-Based Compensation Expense Recognized) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2012
Jan. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation expense, pre-tax $ 3,316 $ 3,969 $ 9,913 $ 11,775
Tax benefit from stock-based compensation expense (1,147) (1,449) (3,475) (4,298)
Total stock-based compensation expense, net of tax 2,169 2,520 6,438 7,477
Restricted Stock [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation expense, pre-tax 3,198 3,481 9,119 10,633
Stock Options And SARs [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation expense, pre-tax 264 400 709 847
ESPP [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation expense, pre-tax $ (146) $ 88 $ 85 $ 295