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Stock-Based Compensation (Summary Of RSU's Activity)(Details) (USD $)
12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Performance Based RSUs [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Issued and outstanding, Beginning balance 237,076 174,570 117,900
Awarded in period 129,075 134,250 125,475
Cancelled due to non-achievement of performance goals (24,311) (48,870) (63,145)
Settled in common stock (49,546) (666) (364)
Forfeited (13,189) (22,208) (5,296)
Issued and outstanding, Ending balance 279,105 237,076 174,570
Serviced-Based RSUs [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Issued and outstanding, Beginning balance 155,728 119,100 60,500
Awarded in period 63,025 64,750 61,825
Cancelled due to non-achievement of performance goals 0 0 0
Settled in common stock (58,328) (17,951) (260)
Forfeited (5,425) (10,171) (2,965)
Issued and outstanding, Ending balance 155,000 155,728 119,100
Restricted Stock Units (RSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Issued and outstanding, Beginning balance 392,804 293,670 178,400
Awarded in period 192,100 199,000 187,300
Cancelled due to non-achievement of performance goals (24,311) (48,870) (63,145)
Settled in common stock (107,874) (18,617) (624)
Forfeited (18,614) (32,379) (8,261)
Issued and outstanding, Ending balance 434,105 392,804 293,670
Weighted average grant date fair value, beginning balance $ 18.75 $ 20.25 $ 21.99
Weighted average grant date fair value, Awarded $ 17.76 $ 17.00 $ 19.25
Weighted average grant date fair value, cancelled due to non-achievement of performance goals $ 17.09 $ 19.81 $ 22.10
Weighted average grant date fair value, settled in common shares $ 20.66 $ 21.15 $ 22.10
Weighted average grant date fair value, forfeited $ 17.91 $ 19.30 $ 21.96
Weighted average grant date fair value, ending balance $ 17.96 $ 18.75 $ 20.25