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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 22, 2017
Oct. 01, 2017
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Income Tax Contingency          
Federal statutory income tax rate 21.00% 35.00% 24.50% 35.00% 35.00%
Transition Tax on Undistributed Foreign Earnings Deemed To Be Repatriated     $ 30,795    
Withholding Taxes on Undistributed Foreign Earnings Deemed to be Repatriated     10,383    
Additional Income Tax Provision For Remaining Undistributed Foreign Earnings     0    
Income tax benefit due to remeasurement of deferred tax assets and liabilities     10,946    
Foreign Earnings Repatriated     235,263   $ 90,937
Unrecognized tax benefits as a result of lapse of statue of limitations     0    
Accrued interest and penalties     710 $ 567  
Additional interest expensed     143 $ 106  
Foreign Tax Authority          
Income Tax Contingency          
Tax benefit carryforwards     33,479    
Domestic Tax Authority          
Income Tax Contingency          
Tax benefit carryforwards     11,980    
State and Local Jurisdiction          
Income Tax Contingency          
Tax benefit carryforwards     $ 4,303