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Income Taxes (Components of Net Deferred Tax Assets) (Details) - USD ($) $ in Thousands | Sep. 29, 2017 | Sep. 30, 2016
--- | --- | ---
Obligations relating to: |  |
Defined benefit pension plans | $ 52,299 | $ 77,834
Other employee benefit plans | 192,299 | 179,063
Net Operating Losses | 136,783 | 139,125
Self-insurance programs | 489 | 1,722
Contract revenues and costs | (18,374) | (8,177)
Deferred Rent | 25,654 | 7,955
Restructuring | 18,258 | 47,792
Other | 19,389 | 9,933
Valuation Allowance | (58,097) | (41,684)
Gross deferred tax assets | 368,700 | 413,563
Deferred tax liabilities: |  |
Depreciation and amortization | (176,327) | (154,939)
Other, net | (1,438) | (1,555)
Gross deferred tax liabilities | (177,765) | (156,494)
Net deferred tax assets | $ 190,935 | $ 257,069

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