Debt (2.0% Convertible Notes) (Details) (Convertible Notes 2.00%, Maturing Fiscal Year 2024 [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended	12 Months Ended
Jul. 28, 2012	Jul. 30, 2011	Jan. 28, 2012
Convertible Notes 2.00%, Maturing Fiscal Year 2024 [Member]
Debt Instrument [Line Items]
Principal amount	$ 230,000	$ 230,000	$ 230,000
Debt interest rate	2.00%	2.00%	2.00%
Debt maturity date	2024	2024	2024
Debt issuance date	March 2004
Debt conversion rate per share	$ 11.97
Common stock to be issued upon conversion, shares	19,219
Debt instrument, optional put date, first	2014
Debt instrument, optional put date, second	2019
Debt instrument, call date	Mar. 21, 2011
Terms of conversion	The holders may convert the notes at the following times, among others: (i) if our share price is greater than 120% of the applicable conversion price for a certain trading period; (ii) if the credit ratings of the notes are below a certain threshold; or (iii) upon the occurrence of certain consolidations, mergers or share exchange transactions involving us.
Percentage of share price over conversion price for conversion	120.00%
Net reduction in stockholders' equity	25,000
Non-convertible borrowing rate	6.25%
Fair value of liability component, upon issuance	158,148
Carrying amount of the equity component	$ 71,852

The fair value of the liability component of convertible debt upon issuance .

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The non-convertible borrowing rate used to determine the fair value of the liability component of convertible debt.

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No definition available.

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The percentage at which if an entity's share price exceeds the conversion price for a certain trading period, holders of the convertible debt instrument may exercise the conversion feature.

+ References

No definition available.

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- Definition

First date on which holders of the debt instrument shall have the option to require the issuer to repurchase the debt instrument.

+ References

No definition available.

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Second date on which holders of the debt instrument shall have the option to require the issuer to repurchase the debt instrument.

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No definition available.

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The initial fair value of option contracts indexed to the entity's own equity that have been classified as permanent equity.

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No definition available.

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The earliest date, before maturity, on which the issuer can call the outstanding debt instrument for repayment or conversion to equity, which may be presented in a variety of ways (year only, month and year, day, month and year, quarter, etc.).

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

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Description of the conversion terms of a debt instrument which may include the conversion ratio (including all potential conversion ratios if contingently adjustable), type of debt or equity security into which the debt is convertible, the dollars of debt or the number of shares into which the instrument is convertible (or potentially convertible into), the conversion period, any contingencies associated with the conversion terms, and the existence and amount of a beneficial conversion feature.

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The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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Interest rate stated in the contractual debt agreement.

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Date when the debt instrument was issued, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).

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Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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