Employee Benefit Plans (Details)	12 Months Ended
	Oct. 01, 2017 USD ($) Year	Oct. 02, 2016 USD ($)	Sep. 27, 2015 USD ($)	Sep. 30, 2012	Oct. 02, 2011
Postemployment Benefits [Abstract]
Maximum annual contribution per employee, percent	50.00%
Minimum age employee may contribute additional percentage of wages | Year	50
Maximum additional contribution allowed after age 50, percent	75.00%
Employer contributions	$ 4,400,000
Period of active service	10 years
Fair value of plan assets	$ 4,300,000
Benefit obligations	3,900,000	$ 6,600,000
Unrealized actuarial loss on pension benefits	$ (100,000)	$ (3,900,000)	$ (300,000)
Discount rate assumption	1.60%	2.80%		1.00%	2.10%
Estimated future employer contributions in the next twelve months	$ 0