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Cash, Cash Equivalents and Short-Term Investments (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 02, 2012
Amortized cost and Estimated Fair Value of Short-term fixed Income Securities [Abstract]  
Due within one year, Amortized Cost $ 914,746
Due between one and two years, Amortized Cost 496,450
Due between two and three years, Amortized Cost 418,018
Due after three years, Amortized Cost 103,626
Total, Amortized Cost 1,932,840
Due within one year, Estimated Fair value 916,557
Due between one and two years, Estimated Fair value 500,531
Due between two and three years, Estimated Fair value 423,287
Due after three years, Estimated Fair value 106,083
Total, Estimated Fair value $ 1,946,458