Employee Stock Award, Option and Benefit Plans - Employee Retirement and Investment and Stock Purchase Plans (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Sep. 28, 2013
Employee Retirement and Investment Plan [Abstract]
Postretirement benefit plan, maximum employer contribution rate	4.00%
Service length eligibility for matching contribution (in years)	1 year
Employer contributions to retirement and investment plans net of forfeitures	$ 3.6	$ 3.6	$ 3.4
Employee Stock Purchase Plans
Employee Stock Purchase Plan [Abstract]
Employee stock purchase plan, authorized payroll deductions, maximum rate	10.00%
Employee stock purchase plan, purchase discount from fair market value	85.00%
Employee stock purchase plan, common stock purchased and distributed	132,004	134,321	159,754
Employee stock purchase plan, weighted average price of shares purchased	$ 51.34	$ 48.68	$ 37.20
Employee stock purchase plan, common stock reserved for future issuance	661,900