Retirement Plans Narrative (Details) $ in Millions	12 Months Ended
	Sep. 25, 2015 USD ($) contract	Sep. 26, 2014 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of Life Insurance Contract Held in Rabbi Trust | contract	134
Deferred Compensation Plan Assets	$ 57.9	$ 56.3
Deferred Compensation Plan Assets, Death Benefit on Insurance Contracts	147.3	145.7
Deferred Compensation Plan Assets, Loans Outstanding Against Insurance Contracts	40.4	38.2
Non-U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Deferred Compensation Plan Assets, Collateral For Plan Benefits	9.8	$ 11.0
Moody's, Aa1 Rating [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Lower Threshold for Discount Rate Basis, Corporate Bonds	$ 250.0