Cash, Cash Equivalents and Short-Term Investments (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 01, 2013
Amortized cost and Estimated Fair Value of Short-term fixed Income Securities [Abstract]
Due within one year, Amortized Cost	$ 549,442
Due between one and two years, Amortized Cost	701,820
Due between two and three years, Amortized Cost	728,813
Due after three years, Amortized Cost	360,457
Total, Amortized Cost	2,340,532
Due within one year, Estimated Fair value	550,707
Due between one and two years, Estimated Fair value	706,425
Due between two and three years, Estimated Fair value	732,718
Due after three years, Estimated Fair value	364,263
Total, Estimated Fair value	$ 2,354,113