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Marketable Securities (Tables)

12 Months Ended

Jan. 31, 2012

Marketable Securities [Abstract]

Amortized Cost, Gross Unrealized Gains (Losses) And Fair Value Of Available-For-Sale Securities

		Amortized Cost				Unrealized Gains				Unrealized (Losses)				Fair Value
As of January 31, 2012
Short-term Investments:
Corporate bonds		$	34,899			$	7			$	(28	)		$	34,878
Municipal and pre-refunded municipal bonds			41,519				135				(10	)			41,644
Certificate of deposit			5,225				—				—				5,225
Federal government agencies			4,513				2				—				4,515
Commercial paper			3,580				12				—				3,592
			89,736				156				(38	)			89,854
Long-term Investments:
Corporate bonds			60,852				277				(72	)			61,057
Municipal and pre-refunded municipal bonds			18,410				186				(6	)			18,590
Auction rate securities			22,975				—				(2,778	)			20,197
Treasury bills			14,982				6				—				14,988
Certificate of deposit			6,970				—				(1	)			6,969
Federal government agencies			5,111				2				(1	)			5,112
			129,300				471				(2,858	)			126,913
		$	219,036			$	627			$	(2,896	)		$	216,767
As of January 31, 2011
Short-term Investments:
Municipal and pre-refunded municipal bonds		$	42,996			$	48			$	(9	)		$	43,035
Treasury bills			7,004				4				—				7,008
Federal government agencies			40,842				80				—				40,922
FDIC insured corporate bonds			23,489				66				—				23,555
Variable rate demand notes			1,900				—				—				1,900
			116,231				198				(9	)			116,420
Long-term Investments:
Corporate bonds			137,540				173				(154	)			137,559
Municipal and pre-refunded municipal bonds			143,711				216				(558	)			143,369
Auction rate securities			33,250				—				(3,788	)			29,462
Treasury bills			23,311				34				—				23,345
Federal government agencies			18,225				30				(2	)			18,253
			356,037				453				(4,502	)			351,988
		$	472,268			$	651			$	(4,511	)		$	468,408

Gross Unrealized Losses And Fair Value Of Marketable Securities

		January 31, 2012
		Less Than 12 Months								12 Months or Greater								Total
Description of Securities		Fair Value				Unrealized Losses				Fair Value				Unrealized Losses				Fair Value				Unrealized Losses
Corporate bonds			45,089				(100	)			—				—				45,089				(100	)
Municipal and pre-refunded municipal bonds			9,985				(9	)			2,954				(7	)			12,939				(16	)
Auction rate securities			—				—				20,197				(2,778	)			20,197				(2,778	)
Treasury bills			1,039				—				—				—				1,039				—
Certificate of deposit			1,489				(1	)			—				—				1,489				(1	)
Federal government agencies			1,099				(1	)			—				—				1,099				(1	)
Total			58,701				(111	)			23,151				(2,785	)			81,852				(2,896	)
		January 31, 2011
		Less Than 12 Months								12 Months or Greater								Total
Description of Securities		Fair Value				Unrealized Losses				Fair Value				Unrealized Losses				Fair Value				Unrealized Losses
FDIC insured corporate bonds			67,359				(154	)			—				—				67,359				(154	)
Municipal and pre-refunded municipal bonds			103,090				(567	)			—				—				103,090				(567	)
Auction rate securities			—				—				29,462				(3,788	)			29,462				(3,788	)
Federal government agencies			1,397				(2	)			—				—				1,397				(2	)
Total			171,846				(723	)			29,462				(3,788	)			201,308				(4,511	)

X

- Definition

Tabular disclosure of 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.

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For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value).

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