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Stockholders' Equity (Changes in Non-vested Stock Options) (Details) - Stock Options [Member]
shares in Thousands
 3 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options, beginning balance | shares 1,988
Weighted-Average Grant Date Fair Value Per Share, beginning balance | $ / shares $ 21.64
Options granted, Number of options | shares 674
Options granted, Weighted-Average Grant Date Fair Value Per Share | $ / shares $ 24.59
Options vested, Number of options | shares (795)
Options vested, Weighted-Average Grant Date Fair Value Per Share | $ / shares $ 19.78
Options forfeited, Number of options | shares (5)
Options forfeited, Weighted-Average Grant Date Fair Value Per Share | $ / shares $ 23.87
Number of Options, ending balance | shares 1,862
Weighted-Average Grant Date Fair Value Per Share, ending balance | $ / shares $ 23.50