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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)

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