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Principal Amount, Unamortized Debt Discount, Net Carrying Amount of the Liability Component, and Carrying Amount of the Equity Component of the 4.00% Debentures (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011
Debt Instrument [Line Items]
Principal amount	$ 254,349
Net carrying amount of the liability component	214,573	209,348
4.00% Debentures due 2031
Debt Instrument [Line Items]
Principal amount	253,000
Unamortized debt discount	(39,776)
Net carrying amount of the liability component	213,224
Equity component	$ 43,930

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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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.

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