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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Dec. 31, 2013 | Jun. 30, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Payments for repurchases of common stock |  |  |  | $ 71,751 | $ 125,541 | $ 158,762
Number of stock shares authorized for grants |  |  |  | 2,000 |  |
Exercise prices of stock options outstanding |  |  |  | $ 39.58 | $ 35.35 |
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements |  |  |  | $ 8,823 |  |
Unrecognized compensation cost is expected to be recognized over a weighted-average period |  |  |  | 2 years |  |
Forfeiture rate, Board of Directors |  |  |  | 0.00% |  |
Forfeiture rate, non-Board of Directors |  |  |  | 9.00% |  |
Stock Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vested contractual term, in years |  |  |  | 10 years |  |
Vesting rate |  |  |  | 25.00% |  |
Restricted Stock Award [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted, Number of Shares |  |  |  | 0 |  |
Restricted stock awards granted |  | 24 |  |  |  |
Vesting period, in years |  |  |  | 4 years |  |
Service period for restricted stock award |  |  |  | 4 years |  |
2017 Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation award conditionally awarded date |  |  |  | Oct. 03, 2016 |  |
Stock-based compensation plan effective date |  |  |  | Sep. 14, 2016 |  |
2016 Authorization [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Authorized repurchase amount |  |  |  | $ 500,000 |  |
Payments for repurchases of common stock |  |  |  | $ 71,197 |  |
Repurchase period in years |  |  |  | 3 years |  |
Purchases of treasury stock, number of shares |  |  |  | 1,027 |  |
Goldman Sachs Accelerated Share Repurchase Program [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Payments for repurchases of common stock |  |  |  |  |  | 125,000
Purchases of treasury stock |  |  |  |  |  | $ 125,000
Purchases of treasury stock, number of shares | 458 |  | 2,048 |  |  | 2,506
10b5-1 Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Authorized repurchase amount |  |  |  |  | $ 125,000 |
Payments for repurchases of common stock |  |  |  |  | $ 125,000 |
Purchases of treasury stock, number of shares |  |  |  | 491 | 2,635 |
10b-18 Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Purchases of treasury stock, number of shares |  |  |  | 536 |  |
Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Exercise prices of stock options outstanding |  |  |  | $ 18.67 |  |
Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Exercise prices of stock options outstanding |  |  |  | $ 70.39 |  |

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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=96867065&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=98514028&loc=d3e3291-108585 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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