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Fair Value Measurements Fair Value Measurements Not Practicable (Details) - USD ($) | Jun. 25, 2017 | Sep. 25, 2016
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Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items] |  |
Fair Value, Estimate Not Practicable, Investments | $ 6,818,000 |
Debt, Long-term and Short-term, Combined Amount | $ 568,480,000 | $ 617,167,000

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