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Retirement Benefits (Details) (USD $)	12 Months Ended
Retirement Benefits (Details) (USD $)	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Anual contributions by employer	$ 23,300,000	$ 20,800,000	$ 19,600,000
Stock contributions by employer	6,100,000	5,400,000	4,900,000
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension expense	$ 185,000	$ 281,000	$ 196,000

The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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