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Fair Value Measurements Fair Value Measurements Not Practicable (Details) - USD ($) | Dec. 30, 2018 | Sep. 30, 2018
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Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items] |  |
Fair Value, Estimate Not Practicable, Investments | $ 6,068,000 |
Debt, Long-term and Short-term, Combined Amount | $ 477,832,000 | $ 484,859,000

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