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Stockholders' Equity (Equity Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2015
Payments for Repurchase of Common Stock |  |  |  | $ 125,541 | $ 158,762 | $ 143,224 |
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements |  |  |  | $ 8,067 |  |  |
Unrecognized compensation cost is expected to be recognized over a weighted-average period |  |  |  | 2 years 1 month 6 days |  |  |
Forfeiture rate, Board of Directors |  |  |  | 0.00% |  |  |
Forfeiture rate, non-Board of Directors |  |  |  | 9.00% |  |  |
2015 Authorization [Member] |  |  |  |  |  |  |
Authorized repurchase amount |  |  | $ 300,000 |  |  |  |
Repurchase period in years |  |  | 3 years |  |  |  |
Goldman Sachs Accelerated Share Repurchase Program [Member] |  |  |  |  |  |  |
Payments for Repurchase of Common Stock |  | $ 125,000 |  |  |  |  |
Purchases of treasury stock, number of shares | 458 | 2,048 |  |  | 2,506 |  |
10b5-1 Plan [Member] |  |  |  |  |  |  |
Authorized repurchase amount |  |  |  |  |  |  | $ 125,000
Payments for Repurchase of Common Stock |  |  |  | $ 125,000 |  |  |
Purchases of treasury stock, number of shares |  |  |  | 2,635 |  |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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