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Marketable Securities (Tables)

9 Months Ended

Oct. 31, 2011

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 October 31, 2011
Short-term Investments:
Corporate bonds		$	15,846			$	1			$	(67	)		$	15,780
Municipal and pre-refunded municipal bonds			28,129				25				(21	)			28,133
Certificate of deposit			735				—				—				735
Federal government agencies			2,000				1				—				2,001
			46,710				27				(88	)			46,649
Long-term Investments:
Corporate bonds			65,626				261				(260	)			65,627
Municipal and pre-refunded municipal bonds			36,041				311				(23	)			36,329
Auction rate securities			23,650				—				(2,694	)			20,956
Certificate of deposit			6,234				1				(1	)			6,234
			131,551				573				(2,978	)			129,146
		$	178,261			$	600			$	(3,066	)		$	175,795
As of January 31, 2011
Short-term Investments:
Municipal and pre-refunded municipal bonds		$	42,996			$	48			$	(9	)		$	43,035
Federal government agencies			40,842				80				—				40,922
Treasury bills			7,004				4				—				7,008
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
Federal government agencies			18,225				30				(2	)			18,253
Treasury bills			23,311				34				—				23,345
			356,037				453				(4,502	)			351,988
		$	472,268			$	651			$	(4,511	)		$	468,408
As of October 31, 2010
Short-term Investments:
Municipal and pre-refunded municipal bonds		$	63,043			$	99			$	(5	)		$	63,137
Federal government agencies			73,592				180				—				73,772
Treasury bills			39,550				15				—				39,565
FDIC insured corporate bonds			41,528				151				—				41,679
Variable rate demand notes			31,925				—				—				31,925
			249,638				445				(5	)			250,078
Long-term Investments:
Municipal and pre-refunded municipal bonds			153,409				732				(97	)			154,044
Auction rate securities			33,850				—				(3,707	)			30,143
Federal government agencies			2,004				11				—				2,015
			189,263				743				(3,804	)			186,202
		$	438,901			$	1,188			$	(3,809	)		$	436,280

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- 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

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 320

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Reference 3: 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=d3e62586-112803



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-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

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-Publisher FASB

-Name Emerging Issues Task Force (EITF)

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-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

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



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-Publisher FASB

-Name Accounting Standards Codification

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-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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