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Employee Benefit Plans (Assumptions) (Details)	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Pension Plans
Weighted-average assumptions used to determine benefit obligations
Discount rate	3.93%	3.79%
Rate of compensation increase	3.19%	3.19%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate	3.79%	4.54%	4.13%
Expected long-term return on plan assets	6.24%	6.41%	6.27%
Rate of compensation increase	3.19%	3.39%	3.04%
Other Post-Retirement Benefit Plans
Weighted-average assumptions used to determine benefit obligations
Discount rate	3.56%	3.34%
Rate of compensation increase	3.00%	3.00%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate	3.34%	3.47%	2.63%
Expected long-term return on plan assets	0.00%	0.00%	0.00%
Rate of compensation increase	3.00%	3.00%	2.50%

X

- Definition

The interest rate used to adjust for the time value of money for the plan.

+ 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 (k)(1)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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X

- Definition

Expected rate of compensation increases (for pay-related plans).

+ 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 (k)(2)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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X

- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Expected Long-Term Rate of Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512046

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-Name Accounting Standards Codification
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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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