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Stockholders' Equity (Summary of Activity for Restricted Stock Units) (Details) - Restricted Stock Units (RSUs) [Member]
shares in Thousands
12 Months Ended
Sep. 30, 2020
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of units, beginning balance | shares 9
Units vested, Number | shares (7)
Number of units, ending balance | shares 2
Weighted-Average Grant Date Fair Value Per Unit, beginning balance | $ / shares $ 91.55
Units vested, Weighted-Average Grant Date Fair Value Per Unit | $ / shares 87.30
Weighted-Average Grant Date Fair Value Per Unit, ending balance | $ / shares $ 103.53