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Stock-Based Compensation (Summary Of RSU's Activity) (Details) (USD $)
12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Employee Performance Based Restricted Stock Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Beginning Balance 279,105 237,076 174,570
Granted 75,600 129,075 134,250
Cancelled due to non-achievement of performance goals (23,384) (24,311) (48,870)
Settled in common stock (74,935) (49,546) (666)
Forfeited (20,591) (13,189) (22,208)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 235,795 279,105 237,076
Serviced-Based RSUs [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Beginning Balance 155,000 155,728 119,100
Granted 44,092 63,025 64,750
Cancelled due to non-achievement of performance goals 0 0 0
Settled in common stock (60,310) (58,328) (17,951)
Forfeited (15,407) (5,425) (10,171)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 123,375 155,000 155,728
Restricted Stock Units (RSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Beginning Balance 434,105 392,804 293,670
Granted 119,692 192,100 199,000
Cancelled due to non-achievement of performance goals (23,384) (24,311) (48,870)
Settled in common stock (135,245) (107,874) (18,617)
Forfeited (35,998) (18,614) (32,379)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 359,170 434,105 392,804
Weighted average grant date fair value, beginning balance $ 17.96 $ 18.75 $ 20.25
Weighted average grant date fair value, Awarded $ 36.09 $ 17.76 $ 17.00
Weighted average grant date fair value, cancelled due to non-achievement of performance goals $ 17.62 $ 17.09 $ 19.81
Weighted average grant date fair value, settled in common shares $ 19.75 $ 20.66 $ 21.15
Weighted average grant date fair value, forfeited $ 23.12 $ 17.91 $ 19.30
Weighted average grant date fair value, ending balance $ 22.79 $ 17.96 $ 18.75