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Marketable Securities (Tables)

6 Months Ended

Jul. 31, 2011

Marketable Securities

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

		Amortized Cost				Unrealized Gains				Unrealized (Losses)				Fair Value
As of July 31, 2011
Short-term Investments:
Corporate Bonds		$	10,062			$	22			$	(6	)		$	10,078
Municipal and pre-refunded municipal bonds			38,079				57				(17	)			38,119
Federal government agencies			7,130				16				—				7,146
FDIC insured corporate bonds			4,000				4				—				4,004
			59,271				99				(23	)			59,347
Long-term Investments:
Corporate bonds			134,199				857				(13	)			135,043
Municipal and pre-refunded municipal bonds			85,639				624				(39	)			86,224
Federal government agencies			49,872				386				—				50,258
Auction rate securities			26,525				—				(3,021	)			23,504
Treasury bills			19,639				190				—				19,829
Certificate of deposit			5,144				—				(1	)			5,143
Variable rate demand notes			2,902				—				(1	)			2,901
			323,920				2,057				(3,075	)			322,902
		$	383,191			$	2,156			$	(3,098	)		$	382,249
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
Federal government agencies			18,225				30				(2	)			18,253
Auction rate securities			33,250				—				(3,788	)			29,462
Treasury bills			23,311				34				—				23,345
			356,037				453				(4,502	)			351,988
		$	472,268			$	651			$	(4,511	)		$	468,408
As of July 31, 2010
Short-term Investments:
Municipal and pre-refunded municipal bonds		$	75,590			$	104			$	(9	)		$	75,685
Federal government agencies			172,200				335				—				172,535
Treasury bills			49,631				36				—				49,667
FDIC insured corporate bonds			37,697				181				(83	)			37,795
Variable rate demand notes			10,425				—				—				10,425
			345,543				656				(92	)			346,107
Long-term Investments:
Municipal and pre-refunded municipal bonds			119,316				835				(52	)			120,099
Federal government agencies			2,004				11				—				2,015
Auction rate securities			35,325				—				(3,868	)			31,457
FDIC insured corporate bonds			4,002				34				—				4,036
			160,647				880				(3,920	)			157,607
		$	506,190			$	1,536			$	(4,012	)		$	503,714

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-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

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-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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