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Income Taxes - Schedule of Reconciliation of Beginning and Ending Amounts of Unrecognized Income Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of fiscal year $ 3,115 $ 2,799 $ 2,353
Gross increases for tax positions of prior years 21 184 534
Gross increases for tax positions of the current year 2,893 163 0
Gross decreases for tax positions of prior years (188) (31) (88)
Balance at end of fiscal year $ 5,841 $ 3,115 $ 2,799