Pension Benefits - Schedule of Allocation of Plan Assets (Details)	12 Months Ended
Dec. 25, 2016
Pension Benefits
Percent of funded status policy minimum range	95.00%
Percent of funded status policy maximum range	97.50%
Long Duration Assets [Member]
Pension Benefits
Target allocation percentage of assets, range minimum	53.00%
Target allocation percentage of assets, range maximum	63.00%
Return Seeking Assets [Member]
Pension Benefits
Target allocation percentage of assets, range minimum	37.00%
Target allocation percentage of assets, range maximum	47.00%
Company Sponsored Pension Plan [Member] \| Public Equity [Member]
Pension Benefits
Equity securities target allocation, range minimum	70.00%
Equity securities allocation, range maximum	90.00%
Actual return of plan asset allocations	45.00%
Company Sponsored Pension Plan [Member] \| Growth Fixed Income Member]
Pension Benefits
Equity securities target allocation, range minimum	0.00%
Equity securities allocation, range maximum	15.00%
Actual return of plan asset allocations	51.00%
Company Sponsored Pension Plan [Member] \| Alternatives [Member]
Pension Benefits
Equity securities target allocation, range minimum	0.00%
Equity securities allocation, range maximum	15.00%
Actual return of plan asset allocations	3.00%
Company Sponsored Pension Plan [Member] \| Cash and Cash Equivalents [Member]
Pension Benefits
Equity securities target allocation, range minimum	0.00%
Equity securities allocation, range maximum	10.00%
Actual return of plan asset allocations	1.00%

The target allocation percentage of total plan assets, maximum limit, per our asset allocation strategy.

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The target allocation percentage of total plan assets, minimum limit, per our asset allocation strategy.

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Percent of Funded Status Policy Maximum Range

+ References

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Percent of Funded Status Policy, Minimum Range

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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.

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Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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