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Stockholders' Equity (Changes in Non-vested Stock Options) (Details) - Stock Options [Member]
shares in Thousands
 3 Months Ended
Dec. 31, 2020
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Options, beginning balance | shares 2,078
Options granted, Number of options | shares 747
Options vested, Number of options | shares (652)
Options forfeited, Number of options | shares (3)
Number of Options, ending balance | shares 2,170
Weighted-Average Grant Date Fair Value Per Share, beginning balance | $ / shares $ 24.69
Options granted, Weighted-Average Grant Date Fair Value Per Share | $ / shares 27.73
Options vested, Weighted-Average Grant Date Fair Value Per Share | $ / shares 25.81
Options forfeited, Weighted-Average Grant Date Fair Value Per Share | $ / shares 25.18
Weighted-Average Grant Date Fair Value Per Share, ending balance | $ / shares $ 25.40