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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.

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Unrecognized cost of unvested share-based compensation awards.

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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.

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The cash outflow to reacquire common stock during the period.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Percentage of vesting of share-based compensation awards.

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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.

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Amount of stock repurchase plan authorized.

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Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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As of the balance sheet date, the forfeiture rate used to calculate the aggregate unrecognized cost of equity-based awards made to employees and members of the board of directors under equity-based compensation awards that have yet to vest. This is the rate applied to shares granted to members of our Board of Directors.

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