Retirement Plans (Retirement Plan Costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
Pension Expense	$ 4,804	$ 2,960	$ 3,994
Retirement savings plan [Member]
Pension Expense	1,560	1,242	1,134
Profit-sharing plan [Member]
Pension Expense	1,650	1,650	1,414
Employee stock bonus plan [Member]
Pension Expense			(3)
Deferred compensation plan [Member]
Pension Expense	291	(26)	570
Supplemental retirement plan [Member]
Pension Expense	1,105	111	798
Pharmacist deferred compensation plan [Member]
Pension Expense	$ 198	$ (17)	$ 81

- Definition

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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