Stock-Based Awards - Class A Common Stock Reserved for Issuance (Details) - shares shares in Thousands	Dec. 31, 2017	Dec. 25, 2016
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, outstanding	7,331	8,747
Shares, available for issuance	16,643	16,369
Class A Common Stock \| Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, available for issuance	6,410	6,410
Class A Common Stock \| Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, available for issuance	7,188	6,914
Stock Options and Stock-Settled Restricted Stock Units [Member] \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, outstanding	4,772	5,588
Stock-Settled Performance Awards [Member] \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, outstanding	2,559	3,159
Pension Plan [Member] \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, available for issuance	3,045	3,045
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of performance awards granted	0.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of performance awards granted	200.00%

Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Target Number of Performance Awards Granted

No definition available.

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- Definition

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.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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- Definition

Number of shares issued which are neither cancelled nor held in the treasury.

+ References

No definition available.

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