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Stockholders' Equity (Changes in Nonvested Stock Options) (Details) - $ / shares shares in Thousands | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Stock-Based Compensation |  |  |
Number of Options, beginning balance | 2,075 |  |
Weighted-Average Grant Date Fair Value Per Share, beginning balance | $ 14.90 |  |
Options granted, Number of options | 791 |  |
Options granted, Weighted-Average Grant Date Fair Value Per Share | $ 24.98 | $ 13.39 | $ 17.02
Options vested, Number of options | (763) |  |
Options vested, Weighted-Average Grant Date Fair Value Per Share | $ 15.26 |  |
Options forfeited, Number of options | (31) |  |
Options forfeited, Weighted-Average Grant Date Fair Value Per Share | $ 15.40 |  |
Number of Options, ending balance | 2,072 | 2,075 |
Weighted-Average Grant Date Fair Value Per Share, ending balance | $ 18.61 | $ 14.90 |

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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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