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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

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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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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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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