Convertible Senior Notes - Carrying Values of Notes (Detail) - USD ($) $ in Thousands	Aug. 01, 2015	Jan. 31, 2015
Convertible Senior Notes Due 2020 [Member]
Liability component
Principal	$ 300,000
Less: Debt discount	(82,253)
Net carrying amount	217,747
Equity component	84,003
Convertible Senior Notes Due 2019 [Member]
Liability component
Principal	350,000	$ 350,000
Less: Debt discount	(55,976)	(62,513)
Net carrying amount	294,024	287,487
Equity component	$ 70,482	$ 70,482

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- References

No definition available.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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