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Stock-Based Compensation (Summary Of RSU's Activity) (Details) - $ / shares
12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
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 117,687 89,182 97,651
Granted 124,374 61,379 45,615
Cancelled due to non-achievement of performance goals (17,461) (11,305) (10,352)
Settled in common stock (19,058) (18,628) (34,475)
Forfeited (73,858) (2,941) (9,257)
Issued and outstanding, ending balance 131,684 117,687 89,182
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 79,210 61,269 55,059
Granted 76,846 42,691 30,335
Cancelled due to non-achievement of performance goals 0 0 0
Settled in common stock (27,208) (21,521) (18,778)
Forfeited (37,377) (3,229) (5,347)
Issued and outstanding, ending balance 91,471 79,210 61,269
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 196,897 150,451 152,710
Granted 201,220 104,070 75,950
Cancelled due to non-achievement of performance goals (17,461) (11,305) (10,352)
Settled in common stock (46,266) (40,149) (53,253)
Forfeited (111,235) (6,170) (14,604)
Issued and outstanding, ending balance 223,155 196,897 150,451
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 $ 66.68 $ 76.91 $ 73.34
Weighted average grant date fair value, Awarded 66.00 53.95 104.10
Weighted average grant date fair value, cancelled due to non-achievement of performance goals 89.31 85.13 80.26
Weighted average grant date fair value, settled in common shares 88.57 67.03 60.50
Weighted average grant date fair value, forfeited 71.63 86.68 79.49
Weighted average grant date fair value, ending balance $ 64.81 $ 66.68 $ 76.91
Restricted Stock Units (RSUs) [Member] | Non Employee Directors only      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 2 years    
Restricted Stock Units (RSUs) [Member] | Employee Only      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years