Retirement Plan (Details) - USD ($)	12 Months Ended
	Sep. 26, 2017	Sep. 27, 2016
Retirement Benefits [Abstract]
Percentage of gross pay matched by employer on dollar-for-dollar basis	3.00%
Percentage of each dollar of employee contributions matched by employer	50.00%
Maximum employee contribution percentage	5.00%
Matching contributions	$ 122,000	$ 123,000