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Stock-Based Compensation (Summary Of RSU's Activity) (Details) - $ / shares
12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Employee Performance Based Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Issued and outstanding, beginning balance 235,795 279,105 237,076
Granted 79,500 75,600 129,075
Cancelled due to non-achievement of performance goals (16,218) (23,384) (24,311)
Settled in common stock (79,407) (74,935) (49,546)
Forfeited (8,726) (20,591) (13,189)
Issued and outstanding, ending balance 210,944 235,795 279,105
Serviced-Based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Issued and outstanding, beginning balance 123,375 155,000 155,728
Granted 40,100 44,092 63,025
Cancelled due to non-achievement of performance goals 0 0 0
Settled in common stock (54,861) (60,310) (58,328)
Forfeited (4,764) (15,407) (5,425)
Issued and outstanding, ending balance 103,850 123,375 155,000
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Issued and outstanding, beginning balance 359,170 434,105 392,804
Granted 119,600 119,692 192,100
Cancelled due to non-achievement of performance goals (16,218) (23,384) (24,311)
Settled in common stock (134,268) (135,245) (107,874)
Forfeited (13,490) (35,998) (18,614)
Issued and outstanding, ending balance 314,794 359,170 434,105
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted average grant date fair value, beginning balance $ 22.79 $ 17.96 $ 18.75
Weighted average grant date fair value, Awarded 30.82 36.09 17.76
Weighted average grant date fair value, cancelled due to non-achievement of performance goals 36.18 17.62 17.09
Weighted average grant date fair value, settled in common shares 17.45 19.75 20.66
Weighted average grant date fair value, forfeited 27.78 23.12 17.91
Weighted average grant date fair value, ending balance $ 27.15 $ 22.79 $ 17.96