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Marketable Securities (Tables)

3 Months Ended

Apr. 30, 2013

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

The amortized cost, gross unrealized gains (losses) and fair value of available-for-sale securities by major security type and class of security as of April 30, 2013, January 31, 2013 and April 30, 2012 were as follows:

		Amortized Cost				Unrealized Gains				Unrealized (Losses)				Fair Value
As of April 30, 2013
Short-term Investments:
Corporate bonds		$	76,563			$	49			$	(26	)		$	76,586
Municipal and pre-refunded municipal bonds			75,507				58				(1	)			75,564
Certificates of deposit			40,222				23				—				40,245
Treasury bills			12,060				1				—				12,061
Federal government agencies			2,000				—				—				2,000
Commercial paper			8,476				6				—				8,482
			214,828				137				(27	)			214,938
Long-term Investments:
Corporate bonds			76,717				117				(44	)			76,790
Municipal and pre-refunded municipal bonds			50,913				121				(4	)			51,030
Certificates of deposit			2,099				1				—				2,100
Treasury bills			9,666				4				—				9,670
Federal government agencies			9,845				—				(1	)			9,844
Mutual funds, held in rabbi trust			328				9				—				337
			149,568				252				(49	)			149,771
		$	364,396			$	389			$	(76	)		$	364,709
As of January 31, 2013
Short-term Investments:
Corporate bonds		$	88,432			$	106			$	(23	)		$	88,515
Municipal and pre-refunded municipal bonds			63,355				85				(17	)			63,423
Certificates of deposit			40,870				25				—				40,895
Treasury bills			21,354				14				—				21,368
Federal government agencies			3,500				4				—				3,504
Commercial paper			10,775				8				(2	)			10,781
			228,286				242				(42	)			228,486
Long-term Investments:
Corporate bonds			64,219				102				(61	)			64,260
Municipal and pre-refunded municipal bonds			52,925				76				(60	)			52,941
Certificates of deposit			2,340				—				—				2,340
Treasury bills			19,724				13				—				19,737
Federal government agencies			5,974				5				(2	)			5,977
Auction rate securities			4,925				—				(595	)			4,330
			150,107				196				(718	)			149,585
		$	378,393			$	438			$	(760	)		$	378,071

		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
Certificates of deposit			13,665				4				—				13,669
Treasury bills			11,694				—				(1	)			11,693
Federal government agencies			6,615				—				(1	)			6,614
Commercial paper			7,572				9				—				7,581
			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
Certificates of deposit			8,170				2				(1	)			8,171
Treasury bills			12,944				6				—				12,950
Auction rate securities			4,925				—				(595	)			4,330
			91,533				325				(627	)			91,231
		$	208,478			$	457			$	(648	)		$	208,287

X

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References

Reference 1: 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 2: 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 3: 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 4: 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 5: 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 6: 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 7: 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 8: 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



Reference 9: 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 10: 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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