Share Plans (Details 2) (USD $)	12 Months Ended
Sep. 28, 2012 Y	Sep. 30, 2011 Y	Sep. 24, 2010 Y
Schedule of weighted average assumptions
Fair value assumption, expected stock price volatility (as a percent)	36.00%	33.00%	34.00%
Fair value assumption, risk-free interest rate (as a percent)	1.46%	1.30%	2.50%
Fair value assumption, expected annual dividend, per share (in dollars per share)	$ 1.00	$ 0.84	$ 0.80
Fair value assumption, expected option life (in years)	5.8	5.2	5.5

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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