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Consolidated Statements of Comprehensive Earnings (Unaudited) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 01, 2012
Nov. 26, 2011
Dec. 01, 2012
Nov. 26, 2011
Statement of Other Comprehensive Income [Abstract]        
Tax expense (benefit) on marketable securities $ 0 $ 0 $ 5 $ (4)