v2.3.0.15
Marketable Securities (Details) (USD $)
3 Months Ended9 Months Ended
Oct. 30, 2011
Oct. 31, 2010
Oct. 30, 2011
Oct. 31, 2010
Jan. 30, 2011
Summary of cash equivalents and marketable securities:     
Amortized Cost$ 2,320,984,000 $ 2,320,984,000 $ 2,165,536,000
Unrealized Gain10,998,000 10,998,000 10,926,000
Unrealized Loss(1,397,000) (1,397,000) (473,000)
Estimated Fair Value2,330,585,000 2,330,585,000 2,175,989,000
Classified as:     
Cash equivalents149,047,000 149,047,000 350,787,000
Marketable securities2,181,538,000 2,181,538,000 1,825,202,000
Total cash equivalents and marketable securities2,330,585,000 2,330,585,000 2,175,989,000
Schedule of Cash Equivalents and Marketable Securities Available for Sale [Abstract]     
Less than one year1,236,291,000 1,236,291,000 1,176,046,000
Due in 1-5 years984,387,000 984,387,000 899,993,000
Mortgage-backed securities issued by government-sponsored enterprises not due to a single maturity date100,306,000 100,306,000 89,497,000
Estimated Fair Value     
Less than one year1,237,962,000 1,237,962,000 1,178,733,000
Due in 1-5 years988,574,000 988,574,000 904,926,000
Mortgage-backed securities issued by government-sponsored enterprises not due to a single maturity date104,049,000 104,049,000 92,330,000
Net realized gain100,000300,000500,0001,300,000 
Debt securities of United States government agencies
     
Summary of cash equivalents and marketable securities:     
Amortized Cost607,828,000 607,828,000 531,789,000
Unrealized Gain1,134,000 1,134,000 1,034,000
Unrealized Loss(330,000) (330,000) (226,000)
Estimated Fair Value608,632,000[1] 608,632,000[1] 532,597,000
Classified as:     
Total cash equivalents and marketable securities608,632,000[1] 608,632,000[1] 532,597,000
Debt securities issued by United States Treasury
     
Summary of cash equivalents and marketable securities:     
Amortized Cost430,233,000 430,233,000 435,091,000
Unrealized Gain2,019,000 2,019,000 1,939,000
Unrealized Loss(505,000) (505,000) (18,000)
Estimated Fair Value431,747,000[2] 431,747,000[2] 437,012,000
Classified as:     
Total cash equivalents and marketable securities431,747,000[2] 431,747,000[2] 437,012,000
Corporate debt securities
     
Summary of cash equivalents and marketable securities:     
Amortized Cost1,105,438,000 1,105,438,000 925,226,000
Unrealized Gain2,840,000 2,840,000 3,354,000
Unrealized Loss(531,000) (531,000) (208,000)
Estimated Fair Value1,107,747,000[3] 1,107,747,000[3] 928,372,000
Classified as:     
Total cash equivalents and marketable securities1,107,747,000[3] 1,107,747,000[3] 928,372,000
Mortgage backed securities issued by United Sates government-sponsored enterprises
     
Summary of cash equivalents and marketable securities:     
Amortized Cost141,189,000 141,189,000 140,844,000
Unrealized Gain5,005,000 5,005,000 4,599,000
Unrealized Loss(31,000) (31,000) (21,000)
Estimated Fair Value146,163,000[4] 146,163,000[4] 145,422,000
Classified as:     
Total cash equivalents and marketable securities146,163,000[4] 146,163,000[4] 145,422,000
Money market funds
     
Summary of cash equivalents and marketable securities:     
Amortized Cost36,296,000 36,296,000 132,586,000
Unrealized Gain    0
Unrealized Loss    0
Estimated Fair Value36,296,000[5] 36,296,000[5] 132,586,000
Classified as:     
Total cash equivalents and marketable securities$ 36,296,000[5] $ 36,296,000[5] $ 132,586,000
[1]Includes $23.5 million in Cash Equivalents and $585.1 million in Marketable Securities on the Condensed Consolidated Balance Sheet.
[2]Includes $23.7 million in Cash Equivalents and $408.1 million in Marketable Securities on the Condensed Consolidated Balance Sheet.
[3]Includes $65.6 million in Cash Equivalents and $1,042.2 million in Marketable Securities on the Condensed Consolidated Balance Sheet.
[4]Included in Marketable Securities on the Condensed Consolidated Balance Sheet
[5]Included in Cash Equivalents on the Condensed Consolidated Balance Sheet.