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Retirement Plans (Retirement Plan Costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Defined Benefit Plan Disclosure [Line Items]
Pension Expense	$ 5,171us-gaap_PensionExpense	$ 5,794us-gaap_PensionExpense	$ 4,804us-gaap_PensionExpense
Retirement savings plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Expense	1,752	1,715	1,560
Profit-sharing plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Expense	1,258	1,750	1,650
Deferred compensation plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Expense	1,328	126	291
Supplemental retirement plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Expense	1,061	2,025	1,105
Pharmacist deferred compensation plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Expense	$ (228)	$ 178	$ 198

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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