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Income Taxes (Components of Net Deferred Tax Assets) (Details) - USD ($) $ in Thousands | Sep. 27, 2019 | Sep. 28, 2018
--- | --- | ---
Obligations related to: |  |
Defined benefit pension plans | $ 56,854 | $ 39,777
Other employee benefit plans | 149,276 | 135,713
Net Operating Losses | 241,033 | 149,256
Deferred Rent | 84,553 | 145,931
Other | 13,881 | 13,972
Contract revenues and costs | 62,318 | 144,383
Deferred Tax Assets, Deferred Rent | 21,847 | 5,654
Restructuring | 8,205 | 5,289
Other | 3,821 | 0
Valuation Allowance | (153,257) | (256,948)
Gross deferred tax assets | 488,531 | 383,027
Deferred tax liabilities: |  |
Depreciation and amortization | (177,002) | (159,312)
Deferred Tax Liabilities, Self Insurance Programs |  | 0
Unremitted earnings | (29,761) | (48,578)
Other, net | (246) | (8,345)
Gross deferred tax liabilities | (207,009) | (216,235)
Net deferred tax assets | $ 281,522 | $ 166,792

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