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Fair Value Disclosures (Other Financial Instruments) (Details) - USD ($)
$ in Thousands
Mar. 29, 2017
Sep. 28, 2016
Jun. 29, 2016
2.60% notes [Member]      
Fair Value Disclosure, Senior Notes [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 2.60%    
Long-term Debt $ 249,351   $ 248,918
Long-term Debt, Fair Value $ 250,315   252,445
3.88% notes [Member]      
Fair Value Disclosure, Senior Notes [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.88%    
Long-term Debt $ 297,823   297,556
Long-term Debt, Fair Value $ 284,340   302,655
5.00% notes [Member]      
Fair Value Disclosure, Senior Notes [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.00% 5.00%  
Long-term Debt $ 344,208   0
Long-term Debt, Fair Value $ 345,699   $ 0