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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 30, 2016
Oct. 02, 2015
Income Tax Contingency [Line Items]        
Deferred Tax Assets, Valuation Allowance $ 264,944 $ 58,097    
Measurement period adjustments on effective tax rate 1 year      
One time estimated tax on post 1986 earnings $ 14,300      
Repatriation of foreign earnings, income tax expense 93,000      
Estimated valuation allowance   58,100    
Loss carry forwards of foreign subsidiaries $ 662,400 $ 490,900    
Effective income tax rate (percent) 68.90% 26.90% 25.20%  
IRS §179D deduction $ 4,520 $ 3,351 $ 2,153  
Nonrecurring benefit 2,800      
Federal hurricane credit 5,700      
Gross unrecognized tax benefits 179,140 38,580 $ 44,167 $ 42,666
Accrued interest and penalties 56,300 $ 36,600    
Decrease in unrecognized tax benefits 6,500      
Change In tax rate income tax expense benefit $ 139,800      
Statutory tax rate 24.60% 35.00% 35.00%  
Change in enacted tax rate, amount $ 139,800      
Provisional Foreign Tax Credit, Valuation Allowance 104,200      
Change in deferred tax assets valuation allowance, amount 104,221 $ 0    
Foreign income tax rate to new US statutory rate differential, amount 9,900      
Foreign income Tax rate to new US Statutory rate of prior year differential, amount 26,800      
Expiring Between 2018 and 2037 | Foreign Country        
Income Tax Contingency [Line Items]        
Loss carry forwards of foreign subsidiaries 168,100      
No Expiration Date | Foreign Country        
Income Tax Contingency [Line Items]        
Loss carry forwards of foreign subsidiaries 494,300      
Accounting Standards Update 2013-11 [Member]        
Income Tax Contingency [Line Items]        
Gross unrecognized tax benefits 76,700      
Retained Earnings | Accounting Standards Update 2018-02        
Income Tax Contingency [Line Items]        
Cumulative effect of change on retained earnings $ 10,200