Employee Benefit Plans (Summary of Participants) (Details)	Dec. 27, 2013 employees
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Active Employees	5,136
Retirees and Beneficiaries	11,699
Other	5,444	[1]
Total	22,279
Post-retirement Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Active Employees	2,031
Retirees and Beneficiaries	12,148
Other	87	[1]
Total	14,266

[1] For pension plans, the other category consists mostly of terminated but vested former employees. For post-retirement plans, the other category consists of employees on long-term disability that have not yet retired.