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Stockholders' Equity (Summary of Activity for Restricted Stock Units) (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
shares in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Number of units, beginning balance 9 9
Units forfeited, Number (1) (1)
Number of units, ending balance 8 8
Weighted-Average Grant Date Fair Value Per Unit, beginning balance $ 91.55 $ 91.55
Units forfeited, Weighted-Average Grant Date Fair Per Unit 97.56 97.56
Weighted-Average Grant Date Fair Value Per Unit, ending balance $ 90.98 $ 90.98