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Notes Payable - Recognized Amounts in Interest Expense in the Condensed Consolidated Statement of Operations Related to the 4.00% Debentures (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Debt Instrument [Line Items]
Interest Expense	$ 18,866	$ 31,444	$ 18,411
4.00% Debentures due 2031
Debt Instrument [Line Items]
Interest Expense	10,120	8,349	0
Amortization of Debt Discount (Premium)	$ 5,322	$ 4,154	$ 0

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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- Definition

The cost of borrowed funds accounted for as interest that was charged against earnings during the period.

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