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Income Taxes (Components of Net Deferred Tax Assets) (Details) - USD ($)
$ in Thousands
Sep. 28, 2018
Sep. 29, 2017
Obligations related to:    
Defined benefit pension plans $ 30,483 $ 52,299
Other employee benefit plans 190,548 192,299
Net Operating Losses 167,424 136,783
Self-insurance programs 0 489
Contract revenues and costs 130,116 (18,374)
Deferred Tax Assets, Deferred Rent 5,454 25,654
Deferred Rent 145,931 0
Deferred Tax Assets, Tax Credit Carryforwards, Other 8,764  
Restructuring 14,515 18,258
Other 3,533 19,389
Valuation Allowance (264,944) (58,097)
Gross deferred tax assets 431,824 368,700
Deferred tax liabilities:    
Depreciation and amortization (206,705) (176,327)
Deferred Tax Liabilities, Self Insurance Programs (3,513) 0
Unremitted earnings (79,418) 0
Other, net 0 (1,438)
Gross deferred tax liabilities (289,636) (177,765)
Net deferred tax assets $ 142,188 $ 190,935