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Stockholders' Equity (Changes in Nonvested Stock Options) (Details) shares in Thousands | 3 Months Ended
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Dec. 31, 2017 $ / shares shares
Stock-Based Compensation |
Number of Options, beginning balance | shares | 2,072
Weighted-Average Grant Date Fair Value Per Share, beginning balance | $ / shares | $ 18.61
Options granted, Number of options | shares | 744
Options granted, Weighted-Average Grant Date Fair Value Per Share | $ / shares | $ 25.68
Options vested, Number of options | shares | (787)
Options vested, Weighted-Average Grant Date Fair Value Per Share | $ / shares | $ 17.54
Options forfeited, Number of options | shares | (9)
Options forfeited, Weighted-Average Grant Date Fair Value Per Share | $ / shares | $ 19.82
Number of Options, ending balance | shares | 2,020
Weighted-Average Grant Date Fair Value Per Share, ending balance | $ / shares | $ 21.63

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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