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Marketable Securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011	Jan. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sale and maturities of available-for-sale securities			$ 175,991	$ 384,594
Amortization of discounts and premiums, net	1,179	1,776	3,657	6,105
Estimated fair value of available-for-sale securities	239,832	175,795	239,832	175,795	216,767
Auction Rate Securities
Schedule of Available-for-sale Securities [Line Items]
Par value of available-for-sale securities	4,925		4,925
Estimated fair value of available-for-sale securities	4,330	20,956	4,330	20,956	20,197
Other Income
Schedule of Available-for-sale Securities [Line Items]
Net realized gains	$ 36	$ 1,064	$ 249	$ 1,115

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Available for sale Securities, Par Value

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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This item represents the net amount of amortization of purchase discounts and premiums related to investments in debt securities. The purchase discount or premium is amortized to income or expense, respectively, over the life (holding period) of the securities to arrive at an amount of periodic interest income or expense which results in a constant effective yield on the investments.

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