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Stockholders' Equity Stockholders' Equity (Stock-Based Compensation Plans) (Details) shares in Thousands	Sep. 30, 2018 shares
Class of Stock [Line Items]
Shares Reserved (in shares)	1,953
Shares Available to Issue (in shares)	1,405
Options Outstanding (in shares)	1,658
Performance Awards Outstanding (in shares)	526
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)	1,435
Performance Awards Outstanding (in shares)	297
2017 Plan [Member]
Class of Stock [Line Items]
Shares Reserved (in shares)	1,953
Shares Available to Issue (in shares)	1,405
Options Outstanding (in shares)	223
Performance Awards Outstanding (in shares)	229

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Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
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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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-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

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Number of options outstanding, including both vested and non-vested options.

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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