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Stockholders' Equity (Changes in Nonvested Stock Options) (Details) - $ / shares shares in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2018
Stock-Based Compensation |  |
Number of Options, beginning balance | 2,020 | 2,072
Weighted-Average Grant Date Fair Value Per Share, beginning balance | $ 21.63 | $ 18.61
Options granted, Number of options | 6 | 750
Options granted, Weighted-Average Grant Date Fair Value Per Share | $ 22.82 | $ 25.66
Options vested, Number of options | (4) | (791)
Options vested, Weighted-Average Grant Date Fair Value Per Share | $ 23.10 | $ 17.57
Options forfeited, Number of options | 0 | (9)
Options forfeited, Weighted-Average Grant Date Fair Value Per Share | $ 0.00 | $ 19.82
Number of Options, ending balance | 2,022 | 2,022
Weighted-Average Grant Date Fair Value Per Share, ending balance | $ 21.63 | $ 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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