Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans (Details)

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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Retirement Benefits [Abstract]    
Contributions to 401(k) Plan $ 900 $ 900
Discount rate used in determining the liability 6.00% 6.00%
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]    
Balance at beginning of year $ 343 $ 344
Interest expense 3 5
Benefits paid (34) (6)
Actuarial adjustment 1 0
Balance at end of year $ 313 $ 343