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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 29, 2018 | Dec. 30, 2017
--- | --- | ---
Income Taxes [Abstract] |  |
Accounts receivable | $ 588 | $ 542
Compensated absences | 355 | 848
Employment incentives | 842 | 388
Employee benefit plans | 4,914 | 5,581
General liability insurance | 2,702 | 2,991
Postretirement benefit obligations | 5,272 | 5,365
Net operating loss carryforwards | 8,030 | 7,745
Other | 7,967 | 4,373
Total deferred tax assets | 30,670 | 27,833
Inventories | (9,828) | (8,026)
Unrealized gains on marketable securities | (1,809) | (2,310)
Nondeductible accruals and other | (5,274) | (5,160)
Depreciation | (104,552) | (99,759)
Total deferred tax liabilities | (121,463) | (115,255)
Net deferred tax liability | $ (90,793) | $ (87,422)

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