Fair Value Measurements (Financial Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 28, 2012	Jan. 29, 2012
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Available-for-sale securities	$ 13,029	$ 100,643
Interest rate cap	601	0
Total financial assets	13,630	100,643
Level 1 [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Total financial assets
Level 2 [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Available-for-sale securities	13,029	100,643
Total financial assets	13,630	100,643
Agency Securities [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Available-for-sale securities	8,012	26,132
Agency Securities [Member] | Level 2 [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Available-for-sale securities	8,012	26,132
Corporate Issues [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Available-for-sale securities	0	4,511
Corporate Issues [Member] | Level 2 [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Available-for-sale securities	0	4,511
Bank Time Deposits [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Available-for-sale securities	5,017	70,000
Bank Time Deposits [Member] | Level 2 [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Available-for-sale securities	5,017	70,000
Interest Rate Cap [Member] | Level 2 [Member]
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Interest rate cap	$ 601	$ 0