Fair Value (Summary Of Financial Assets Measured At Fair Value On Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 30, 2011	Jan. 30, 2011
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Financial Assets	$ 134,320	$ 139,323
Quoted Prices In Active Markets For Identical Instruments (Level 1) [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Financial Assets
Observable Inputs Other Than Level 1 Prices (Level 2) [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Financial Assets	134,320	139,323
Agency Securities [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Financial Assets	40,754	54,747
Agency Securities [Member] | Quoted Prices In Active Markets For Identical Instruments (Level 1) [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Financial Assets
Agency Securities [Member] | Observable Inputs Other Than Level 1 Prices (Level 2) [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Financial Assets	40,754	54,747
Corporate Issues [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Financial Assets	13,566	16,576
Corporate Issues [Member] | Quoted Prices In Active Markets For Identical Instruments (Level 1) [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Financial Assets
Corporate Issues [Member] | Observable Inputs Other Than Level 1 Prices (Level 2) [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Financial Assets	13,566	16,576
Bank Time Deposits [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Financial Assets	80,000	68,000
Bank Time Deposits [Member] | Quoted Prices In Active Markets For Identical Instruments (Level 1) [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Financial Assets
Bank Time Deposits [Member] | Observable Inputs Other Than Level 1 Prices (Level 2) [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Financial Assets	$ 80,000	$ 68,000