Retirement Plans (Schedule of Actuarial Assumptions) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 25, 2015	Sep. 26, 2014	Sep. 27, 2013
Effect of One-Percentage Point Change in Assumed Healthcare Cost Trend Rates
One-Percentage-Point Increase, effect on total of service and interest cost	$ 0.0
One-Percentage-Point Decrease, effect on total of service and interest cost	0.0
One-Percentage-Point Increase, effect on postretirement benefit obligation	0.8
One-Percentage-Point Decrease, effect on postretirement obligation	$ (0.7)
U.S. Plans
Weighted Average-Assumptions Used in Calculating Net Periodic Benefit Cost
Discount rate	3.80%	4.20%	3.50%
Expected return on plan assets	6.00%	6.50%	7.90%
Rate of compensation increase	0.00%	0.00%	0.00%
Weighted-Average Assumptions Used in Calculating Benefit Obligations
Discount rate	3.90%	3.90%	4.30%
Rate of compensation increase	0.00%	0.00%	0.00%
Non-U.S. Plans
Weighted Average-Assumptions Used in Calculating Net Periodic Benefit Cost
Discount rate	2.50%	3.50%	4.00%
Expected return on plan assets	2.90%	3.10%	3.50%
Rate of compensation increase	3.20%	3.50%	3.70%
Weighted-Average Assumptions Used in Calculating Benefit Obligations
Discount rate	2.50%	2.50%	3.70%
Rate of compensation increase	3.60%	3.40%	3.50%
Postretirement Benefits
Weighted Average-Assumptions Used in Calculating Net Periodic Benefit Cost
Discount rate	3.60%	4.00%	3.20%
Weighted-Average Assumptions Used in Calculating Benefit Obligations
Discount rate	3.90%	3.70%	4.00%
Healthcare Cost Trend Assumptions
Healthcare cost trend rate assumed for next fiscal year	7.10%	7.10%
Rate to which the cost trend rate is assumed to decline	4.50%	4.50%
Fiscal year the ultimate trend rate is achieved	2029	2029