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Stockholders' Equity Stockholders' Equity (Stock-Based Compensation Plans) (Details) shares in Thousands	Sep. 30, 2019 shares
Class of Stock [Line Items]
Shares Reserved (in shares)	2,709
Shares Available to Issue (in shares)	1,952
Options Outstanding (in shares)	1,076
Performance Awards Outstanding (in shares)	501
Amended And Restated 2006 Plan [Member]
Class of Stock [Line Items]
Shares Reserved (in shares)	0
Shares Available to Issue (in shares)	0
Options Outstanding (in shares)	940
Performance Awards Outstanding (in shares)	0
2017 Plan [Member]
Class of Stock [Line Items]
Shares Reserved (in shares)	2,709
Shares Available to Issue (in shares)	1,952
Options Outstanding (in shares)	136
Performance Awards Outstanding (in shares)	501

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Aggregate number of common shares reserved for future issuance.

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-SubTopic 10
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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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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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