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Assumptions Used to Estimate Fair Value of Options (Detail)	3 Months Ended	12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Apr. 02, 2011	Apr. 03, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Volatility factor	50.20%	46.50%	46.70%	46.40%
Weighted average risk-free interest rate	0.60%	1.80%	3.20%	3.90%
Expected life of option	4 years 9 months	7 years 9 months 18 days	10 years	10 years

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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