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Stockholders' Equity (Schedule Of Option Activity) (Details)
 9 Months Ended 12 Months Ended
Mar. 31, 2020
$ / shares
shares
Jun. 30, 2019
$ / shares
shares
Stockholders' Equity [Abstract]    
Options, Outstanding at beginning of period | shares 1,260,114  
Options, Granted | shares 162,180  
Options, Exercised | shares (260,666)  
Options, Forfeited | shares (4,342)  
Options, Outstanding at end of period | shares 1,157,286 1,260,114
Options, Exercise price of granted options $ 146.34  
Options exercisable at end of period | shares 724,040  
Weighted Average Exercise Price, Outstanding at beginning of period $ 72.91  
Weighted Average Exercise Price, Granted 146.34  
Weighted Average Exercise Price, Exercised 53.41  
Weighted Average Exercise Price, Forfeited 110.19  
Weighted Average Exercise Price, Outstanding at end of period 87.45 $ 72.91
Weighted Average Exercise Price, Options exercisable at end of period $ 70.70  
Weighted Average Remaining Contractual Term in Years, Outstanding 4 years 7 months 6 days 4 years 4 months 24 days