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Principal Amount, Unamortized Premium, and net Carrying Amount of the 6.25% Debentures, Issued Fiscal 2011 (Detail) (USD $) In Thousands	Jul. 31, 2011	Jan. 31, 2011
Debt Instrument [Line Items]
Net carrying amount of the liability component	$ 212,027	$ 209,348
6.25% Debentures due 2026, issued fiscal 2011
Debt Instrument [Line Items]
Principal amount		31,509
Unamortized debt premium		196
Net carrying amount of the liability component		$ 31,705

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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