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Stockholders' Equity (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2017 | Mar. 31, 2016
Payments for repurchases of common stock |  | $ 61,782 | $ 117,820
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements | $ 12,622 | $ 12,622 |
Unrecognized compensation cost is expected to be recognized over a weighted-average period |  | 2 years 3 months 18 days |
Forfeiture rate, Board of Directors | 0.00% | 0.00% |
Forfeiture rate, non-Board of Directors | 9.00% | 9.00% |
Stock Options [Member] |  |  |
Vested contractual term, in years |  | 10 years |
Vesting rate |  | 25.00% |
Vesting period, in years |  | 4 years |
Restricted Stock Award [Member] |  |  |
Shares granted, Number of Shares | 0 | 0 |
Restricted stock awards granted |  | 24 |
Vesting period, in years |  | 4 years |
Service period for restricted stock award |  | 4 years |
2017 Plan [Member] |  |  |
Stock-based compensation award conditionally awarded date |  | Oct. 03, 2016 |
Stock-based compensation award conditionally awarded date approved |  | Jan. 25, 2017 |
Stock-based compensation plan effective date |  | Sep. 14, 2016 |
Number of stock shares authorized for grants | 2,000 | 2,000 |
2016 Authorization [Member] |  |  |
Authorized repurchase amount | $ 500,000 | $ 500,000 |
Payments for repurchases of common stock |  | $ 61,229 |
Repurchase period in years |  | 3 years |
Purchases of treasury stock, number of shares |  | 886 |
10b5-1 Plan [Member] |  |  |
Authorized repurchase amount |  |  | 125,000
Payments for repurchases of common stock |  |  | $ 119,119
Purchases of treasury stock, number of shares |  | 350 | 2,523
10b-18 Plan [Member] |  |  |
Purchases of treasury stock, number of shares |  | 536 |

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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 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=6415400&loc=d3e5070-113901 + Details
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