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Share Plans - Assumptions Used in Calculating Estimated Fair Value of Stock Option Award (Detail)	3 Months Ended
	Jun. 29, 2013	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.82%	0.90%
Expected dividend yield	1.78%	2.29%
Expected share price volatility	36.00%	36.50%
Expected term (years)	5 years 8 months 12 days	5 years 8 months 12 days

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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