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Marketable Securities (Tables)

3 Months Ended

Apr. 30, 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 April 30, 2012
Short-term Investments:
Corporate bonds		$	40,934			$	23			$	(14	)		$	40,943
Municipal and pre-refunded municipal bonds			36,465				96				(5	)			36,556
Treasury bills			11,694				—				(1	)			11,693
Certificate of deposit			13,665				4				—				13,669
Commercial paper			7,572				9				—				7,581
Federal government agencies			6,615				—				(1	)			6,614
			116,945				132				(21	)			117,056
Long-term Investments:
Corporate bonds			46,685				148				(26	)			46,807
Municipal and pre-refunded municipal bonds			18,809				169				(5	)			18,973
Treasury bills			12,944				6				—				12,950
Certificate of deposit			8,170				2				(1	)			8,171
Auction rate securities			4,925				—				(595	)			4,330
			91,533				325				(627	)			91,231
		$	208,478			$	457			$	(648	)		$	208,287
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
Commercial paper			3,580				12				—				3,592
Federal government agencies			4,513				2				—				4,515
			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
Treasury bills			14,982				6				—				14,988
Certificate of deposit			6,970				—				(1	)			6,969
Federal government agencies			5,111				2				(1	)			5,112
Auction rate securities			22,975				—				(2,778	)			20,197
			129,300				471				(2,858	)			126,913
		$	219,036			$	627			$	(2,896	)		$	216,767
		Amortized Cost				Unrealized Gains				Unrealized (Losses)				Fair Value
As of April 30, 2011
Short-term Investments:
Corporate bonds		$	5,377			$	18			$	—			$	5,395
Municipal and pre-refunded municipal bonds			36,498				24				(30	)			36,492
Federal government agencies			16,284				17				—				16,301
FDIC insured corporate bonds			10,478				22				—				10,500
			68,637				81				(30	)			68,688
Long-term Investments:
Corporate bonds			132,937				513				(46	)			133,404
Municipal and pre-refunded municipal bonds			96,748				367				(269	)			96,846
Treasury bills			19,661				92				—				19,753
Federal government agencies			55,122				205				—				55,327
Auction rate securities			30,150				—				(3,434	)			26,716
Variable rate demand notes			1,900				—				—				1,900
			336,518				1,177				(3,749	)			333,946
		$	405,155			$	1,258			$	(3,779	)		$	402,634

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 320

-Section 50

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-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 17

-Subparagraph a, b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 320

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 19, 20, 21

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 03-1

-Paragraph 21

-Subparagraph a, b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27198-111563



Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563

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