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Stockholders' Equity (Schedule Of Activity Of Restricted Stock Units) (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted Stock Units, Outstanding at beginning of period 1,644,754  
Restricted Stock Units, Granted 7,093  
Restricted Stock Units, Vested (2,911)  
Restricted Stock Units, Expired / cancelled (10,206)  
Restricted Stock Units, Forfeited (2,314)  
Restricted Stock Units, Outstanding at end of period 1,636,416 1,644,754
Weighted Average Grant-Date Fair Value, Outstanding at beginning of period $ 62.89  
Weighted Average Grant-Date Fair Value, Granted 104.57  
Weighted Average Grant-Date Fair Value, Vested 64.90  
Weighted Average Grant-Date Fair Value, Expired / cancelled 63.80  
Weighted Average Grant-Date Fair Value, Forfeited 63.80  
Weighted Average Grant-Date Fair Value, Outstanding at end of period $ 63.08 $ 62.89
Weighted Average Remaining Contractual Term in Years, Outstanding 1 year 4 months 24 days 1 year 7 months 6 days