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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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 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).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Net number of non-option equity instruments granted to participants.

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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).

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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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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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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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Date stock-based compensation awards were conditionally awarded subject to stockholder approval.

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The effective date of a stock-based compensation plan

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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2013	Jun. 30, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments for repurchases of common stock				$ 71,751	$ 125,541	$ 158,762
Number of stock shares authorized for grants				2,000
Exercise prices of stock options outstanding				$ 39.58	$ 35.35
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements				$ 8,823
Unrecognized compensation cost is expected to be recognized over a weighted-average period				2 years
Forfeiture rate, Board of Directors				0.00%
Forfeiture rate, non-Board of Directors				9.00%
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested contractual term, in years				10 years
Vesting rate				25.00%
Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted, Number of Shares				0
Restricted stock awards granted		24
Vesting period, in years				4 years
Service period for restricted stock award				4 years
2017 Plan [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 plan effective date				Sep. 14, 2016
2016 Authorization [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized repurchase amount				$ 500,000
Payments for repurchases of common stock				$ 71,197
Repurchase period in years				3 years
Purchases of treasury stock, number of shares				1,027
Goldman Sachs Accelerated Share Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments for repurchases of common stock						125,000
Purchases of treasury stock						$ 125,000
Purchases of treasury stock, number of shares	458		2,048			2,506
10b5-1 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized repurchase amount					$ 125,000
Payments for repurchases of common stock					$ 125,000
Purchases of treasury stock, number of shares				491	2,635
10b-18 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchases of treasury stock, number of shares				536
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise prices of stock options outstanding				$ 18.67
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise prices of stock options outstanding				$ 70.39