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Fair Value Measurements Fair Value Measurements Not Practicable (Details) - USD ($)
Mar. 27, 2016
Sep. 27, 2015
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]    
Fair Value, Estimate Not Practicable, Investments $ 6,359,000  
Debt, Long-term and Short-term, Combined Amount $ 656,498,000 $ 725,872,000