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Significant Accounting Policies (Details 1)
12 Months Ended
Mar. 31, 2012
Y
Mar. 26, 2011
Y
Mar. 27, 2010
Y
Weighted average fair value of options granted      
Risk-free interest rate 1.11% 1.52% 2.24%
Expected life, in years 4 4 5
Expected volatility 33.90% 35.10% 32.80%
Expected dividend yield 1.03% 0.93% 1.04%