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Stockholders' Equity (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2016 | Mar. 31, 2018 | Jun. 30, 2018 | Jun. 30, 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 |
Number of shares available for future grants | 1,300 |  |  |  | 1,300 |  |
Exercise prices of stock options outstanding | $ 45.20 |  |  | $ 44.62 | $ 45.20 |  | $ 39.58
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements | $ 10,938,000 |  |  |  | $ 10,938,000 |  |
Unrecognized compensation cost is expected to be recognized over a weighted-average period |  |  |  |  | 2 years |  |
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 | $ 1,858,000 | $ 1,817,000 |  |  | $ 16,292,000 | 15,580,000 |
Vesting period, in years |  |  |  | 4 years |  |  |
2017 Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
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 |  |  |  |  |  | 886,000 |
10b5-1 Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Purchases of treasury stock, number of shares |  |  |  |  |  | 350,000 |
10b-18 Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Purchases of treasury stock, number of shares |  |  |  |  |  | 536,000 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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 difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -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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