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Stockholders' Equity (Equity Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Payments for Repurchase of Common Stock |  |  | $ 125,542 | $ 157,118 |
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements |  |  | $ 9,654 |  |
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 | 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=56944662&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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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