Fair Value Measurements - Financial Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Jan. 27, 2013	Jan. 29, 2012
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Available-for-sale securities	$ 12,880	$ 100,643
Interest rate cap	544	0
Total financial assets	13,424	100,643
Level 2
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Available-for-sale securities	12,880	100,643
Interest rate cap	544	0
Total financial assets	13,424	100,643
Agency securities
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Available-for-sale securities	7,907	26,132
Agency securities \| Level 2
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Available-for-sale securities	7,907	26,132
Corporate issues
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Available-for-sale securities	0	4,511
Corporate issues \| Level 2
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Available-for-sale securities	0	4,511
Bank time deposits
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Available-for-sale securities	4,973	70,000
Bank time deposits \| Level 2
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Available-for-sale securities	4,973	70,000
Interest rate cap \| Level 2
Fair Value, Assets Measured On A Recurring Basis [Line Items]
Interest rate cap	$ 544	$ 0

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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