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Borrowings (Schedule of Additional Informational 2014 Facility) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 29, 2017 | Sep. 30, 2016
Debt Disclosure [Abstract] |  |
Maximum amount outstanding at any month-end during the fiscal year | $ 659,103 | $ 958,460
Average amount outstanding during the year | $ 639,210 | $ 825,641
Weighted average interest rate during the year | 1.67% | 1.39%

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