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Stockholders' Equity (Changes in Nonvested Stock Options) (Details) - $ / shares shares in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2017
Stock-Based Compensation |  |
Number of Options, beginning balance | 1,304 | 2,075
Weighted-Average Grant Date Fair Value Per Share, beginning balance | $ 14.70 | $ 14.90
Options granted, Number of options | 780 | 780
Options granted, Weighted-Average Grant Date Fair Value Per Share | $ 25.05 | $ 25.05
Options vested, Number of options | (3) | (761)
Options vested, Weighted-Average Grant Date Fair Value Per Share | $ 18.27 | $ 15.25
Options forfeited, Number of options | (5) | (18)
Options forfeited, Weighted-Average Grant Date Fair Value Per Share | $ 14.77 | $ 14.56
Number of Options, ending balance | 2,076 | 2,076
Weighted-Average Grant Date Fair Value Per Share, ending balance | $ 18.58 | $ 18.58

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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=6415400&loc=d3e5070-113901 + Details
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