XML 62 R49.htm IDEA: XBRL DOCUMENT v3.7.0.1
Stock-Based Compensation (Summary Of RSU's Activity) (Details) - $ / shares
12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
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 140,767 210,944 235,795
Granted 36,058 48,201 79,500
Cancelled due to non-achievement of performance goals (4,270) (19,657) (16,218)
Settled in common stock (45,509) (89,665) (79,407)
Forfeited (1,979) (9,056) (8,726)
Issued and outstanding, ending balance 125,067 140,767 210,944
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 75,712 103,850 123,375
Granted 25,322 22,349 40,100
Cancelled due to non-achievement of performance goals 0 0 0
Settled in common stock (32,300) (46,950) (54,861)
Forfeited (1,280) (3,537) (4,764)
Issued and outstanding, ending balance 67,454 75,712 103,850
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 216,479 314,794 359,170
Granted 61,380 70,550 119,600
Cancelled due to non-achievement of performance goals (4,270) (19,657) (16,218)
Settled in common stock (77,809) (136,615) (134,268)
Forfeited (3,259) (12,593) (13,490)
Issued and outstanding, ending balance 192,521 216,479 314,794
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 $ 40.88 $ 27.15 $ 22.79
Weighted average grant date fair value, Awarded 66.58 57.83 30.82
Weighted average grant date fair value, cancelled due to non-achievement of performance goals 64.55 29.92 36.18
Weighted average grant date fair value, settled in common shares 37.09 19.57 17.45
Weighted average grant date fair value, forfeited 49.40 40.99 27.78
Weighted average grant date fair value, ending balance $ 50.09 $ 40.88 $ 27.15