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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Payments for repurchases of common stock |  |  |  | $ 0 | $ 61,782,000 |  |
Exercise prices of stock options outstanding | $ 44.62 |  |  | $ 44.62 |  | $ 44.48 | $ 39.58
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements | $ 12,695,000 |  |  | $ 12,695,000 |  |  |
Unrecognized compensation cost is expected to be recognized over a weighted-average period | 2 years 2 months 12 days |  |  |  |  |  |
Forfeiture rate, Board of Directors | 0.00% |  |  | 0.00% |  |  |
Forfeiture rate, non-Board of Directors | 9.00% |  |  | 9.00% |  |  |
Stock Options [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 award conditionally awarded date approved |  |  | Jan. 25, 2017 |  |  |  |
Vested contractual term, in years |  |  |  | 10 years |  |  |
Vesting rate |  |  |  | 25.00% |  |  |
Employee stock-based compensation expense | $ 2,011,000 | $ 12,502,000 |  | $ 14,434,000 | 13,763,000 |  |
Vesting period, in years |  |  |  | 4 years |  |  |
2017 Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of stock shares authorized for grants | 2,000 |  |  | 2,000 |  |  |
Employee stock-based compensation expense |  |  | $ 0 |  |  |  |
2017 Authorization [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Authorized repurchase amount | $ 500,000,000 |  |  | $ 500,000,000 |  |  |
Payments for repurchases of common stock |  |  |  | $ 0 | $ 61,229,000 |  |
Repurchase period in years | 3 years |  |  |  |  |  |
Purchases of treasury stock, number of shares |  |  |  |  | 886 |  |
10b5-1 Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Purchases of treasury stock, number of shares |  |  |  |  | 350 |  |
10b-18 Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Purchases of treasury stock, number of shares |  |  |  |  | 536 |  |

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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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