XML 26 R37.htm IDEA: XBRL DOCUMENT v2.4.0.6

Marketable Securities (Amortized Cost, Gross Unrealized Gains (Losses) And Fair Value Of Available-For-Sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 219,036	$ 472,268
Unrealized Gains	627	651
Unrealized (Losses)	(2,896)	(4,511)
Fair Value	216,767	468,408
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	95,935	137,559
Municipal And Pre-Refunded Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	60,234	186,404
Certificate Of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	12,194
Federal Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	9,627	59,175
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	3,592
FDIC Insured Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value		23,555
Treasury Bills [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	14,988	30,353
Variable Rate Demand Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value		1,900
Auction Rate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	20,197	29,462
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	89,736	116,231
Unrealized Gains	156	198
Unrealized (Losses)	(38)	(9)
Fair Value	89,854	116,420
Short-Term Investments [Member] | Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	34,899
Unrealized Gains	7
Unrealized (Losses)	(28)
Fair Value	34,878
Short-Term Investments [Member] | Municipal And Pre-Refunded Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	41,519	42,996
Unrealized Gains	135	48
Unrealized (Losses)	(10)	(9)
Fair Value	41,644	43,035
Short-Term Investments [Member] | Certificate Of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,225
Fair Value	5,225
Short-Term Investments [Member] | Federal Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,513	40,842
Unrealized Gains	2	80
Fair Value	4,515	40,922
Short-Term Investments [Member] | Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,580
Unrealized Gains	12
Fair Value	3,592
Short-Term Investments [Member] | FDIC Insured Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		23,489
Unrealized Gains		66
Fair Value		23,555
Short-Term Investments [Member] | Treasury Bills [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		7,004
Unrealized Gains		4
Fair Value		7,008
Short-Term Investments [Member] | Variable Rate Demand Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,900
Fair Value		1,900
Long-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	129,300	356,037
Unrealized Gains	471	453
Unrealized (Losses)	(2,858)	(4,502)
Fair Value	126,913	351,988
Long-Term Investments [Member] | Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	60,852	137,540
Unrealized Gains	277	173
Unrealized (Losses)	(72)	(154)
Fair Value	61,057	137,559
Long-Term Investments [Member] | Municipal And Pre-Refunded Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	18,410	143,711
Unrealized Gains	186	216
Unrealized (Losses)	(6)	(558)
Fair Value	18,590	143,369
Long-Term Investments [Member] | Certificate Of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,970
Unrealized (Losses)	(1)
Fair Value	6,969
Long-Term Investments [Member] | Federal Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,111	18,225
Unrealized Gains	2	30
Unrealized (Losses)	(1)	(2)
Fair Value	5,112	18,253
Long-Term Investments [Member] | Treasury Bills [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,982	23,311
Unrealized Gains	6	34
Fair Value	14,988	23,345
Long-Term Investments [Member] | Auction Rate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	22,975	33,250
Unrealized (Losses)	(2,778)	(3,788)
Fair Value	$ 20,197	$ 29,462

X

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 7

-Footnote 2

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 19

-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 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents 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. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph 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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 22

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13, 19

-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 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

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

+ Details

Name:	us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGain
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLosses1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration