Pension Benefits - Schedule of Allocation of Plan Assets (Details)	12 Months Ended
Dec. 28, 2014
Pension Benefits
Percent of funded status policy minimum range	85.00%
Percent of funded status policy maximum range	90.00%
Long Duration Assets [Member]
Pension Benefits
Target allocation percentage of assets, range minimum	46.00%
Target allocation percentage of assets, range maximum	56.00%
Return Seeking Assets [Member]
Pension Benefits
Target allocation percentage of assets, range minimum	44.00%
Target allocation percentage of assets, range maximum	54.00%
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	32.00%
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	57.00%
Company Sponsored Pension Plan [Member] \| Alternative [Member]
Pension Benefits
Equity securities target allocation, range minimum	0.00%
Equity securities allocation, range maximum	15.00%
Actual return of plan asset allocations	4.00%
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	7.00%

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.

+ References

No definition available.

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- Definition

Percent of Funded Status Policy Maximum Range

+ References

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Percent of Funded Status Policy, Minimum Range

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- Definition

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 1

-Subparagraph (d)(i)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Reference 2: 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=35743120&loc=d3e2446-114920

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

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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=35743120&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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