Retirement Plans (Schedule of Amounts to be Amortized From Accumulated Other Comprehensive Income) (Details) $ in Millions	12 Months Ended
	Sep. 25, 2015 USD ($)
Pension Benefits
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract]
Amortization of net actuarial loss	$ 10.8
Amortization of prior service cost	(0.5)
Postretirement Benefits
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract]
Amortization of net actuarial loss	0.0
Amortization of prior service cost	$ (2.1)