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Marketable Securities (Amortized Cost, Gross Unrealized Gains (Losses) And Fair Value Of Available-For-Sale Securities) (Details) (USD $) In Thousands	Jul. 31, 2011	Jan. 31, 2011	Jul. 31, 2010
Amortized Cost	$ 383,191	$ 472,268	$ 506,190
Unrealized Gains	2,156	651	1,536
Unrealized (Losses)	(3,098)	(4,511)	(4,012)
Fair Value	382,249	468,408	503,714
Short-Term Investments [Member]
Amortized Cost	59,271	116,231	345,543
Unrealized Gains	99	198	656
Unrealized (Losses)	(23)	(9)	(92)
Fair Value	59,347	116,420	346,107
Short-Term Investments [Member] | Corporate Bonds [Member]
Amortized Cost	10,062
Unrealized Gains	22
Unrealized (Losses)	(6)
Fair Value	10,078
Short-Term Investments [Member] | Municipal And Pre-Refunded Municipal Bonds [Member]
Amortized Cost	38,079	42,996	75,590
Unrealized Gains	57	48	104
Unrealized (Losses)	(17)	(9)	(9)
Fair Value	38,119	43,035	75,685
Short-Term Investments [Member] | Federal Government Agencies [Member]
Amortized Cost	7,130	40,842	172,200
Unrealized Gains	16	80	335
Unrealized (Losses)
Fair Value	7,146	40,922	172,535
Short-Term Investments [Member] | FDIC Insured Corporate Bonds [Member]
Amortized Cost	4,000	23,489	37,697
Unrealized Gains	4	66	181
Unrealized (Losses)			(83)
Fair Value	4,004	23,555	37,795
Short-Term Investments [Member] | Treasury Bills [Member]
Amortized Cost		7,004	49,631
Unrealized Gains		4	36
Unrealized (Losses)
Fair Value		7,008	49,667
Short-Term Investments [Member] | Variable Rate Demand Notes [Member]
Amortized Cost		1,900	10,425
Unrealized Gains
Unrealized (Losses)
Fair Value		1,900	10,425
Long-Term Investments [Member]
Amortized Cost	323,920	356,037	160,647
Unrealized Gains	2,057	453	880
Unrealized (Losses)	(3,075)	(4,502)	(3,920)
Fair Value	322,902	351,988	157,607
Long-Term Investments [Member] | Auction Rate Securities [Member]
Amortized Cost	26,525	33,250	35,325
Unrealized Gains
Unrealized (Losses)	(3,021)	(3,788)	(3,868)
Fair Value	23,504	29,462	31,457
Long-Term Investments [Member] | Corporate Bonds [Member]
Amortized Cost	134,199	137,540
Unrealized Gains	857	173
Unrealized (Losses)	(13)	(154)
Fair Value	135,043	137,559
Long-Term Investments [Member] | Municipal And Pre-Refunded Municipal Bonds [Member]
Amortized Cost	85,639	143,711	119,316
Unrealized Gains	624	216	835
Unrealized (Losses)	(39)	(558)	(52)
Fair Value	86,224	143,369	120,099
Long-Term Investments [Member] | Federal Government Agencies [Member]
Amortized Cost	49,872	18,225	2,004
Unrealized Gains	386	30	11
Unrealized (Losses)		(2)
Fair Value	50,258	18,253	2,015
Long-Term Investments [Member] | FDIC Insured Corporate Bonds [Member]
Amortized Cost			4,002
Unrealized Gains			34
Unrealized (Losses)
Fair Value			4,036
Long-Term Investments [Member] | Treasury Bills [Member]
Amortized Cost	19,639	23,311
Unrealized Gains	190	34
Unrealized (Losses)
Fair Value	19,829	23,345
Long-Term Investments [Member] | Certificate Of Deposit [Member]
Amortized Cost	5,144
Unrealized Gains
Unrealized (Losses)	(1)
Fair Value	5,143
Long-Term Investments [Member] | Variable Rate Demand Notes [Member]
Amortized Cost	2,902
Unrealized Gains
Unrealized (Losses)	(1)
Fair Value	2,901
Corporate Bonds [Member]
Fair Value	145,121	137,559
Municipal And Pre-Refunded Municipal Bonds [Member]
Fair Value	124,343	186,404	195,784
Federal Government Agencies [Member]
Fair Value	57,404	59,175	174,550
FDIC Insured Corporate Bonds [Member]
Fair Value	4,004	23,555	41,831
Treasury Bills [Member]
Fair Value	19,829	30,353	49,667
Certificate Of Deposit [Member]
Fair Value	5,143
Variable Rate Demand Notes [Member]
Fair Value	2,901	1,900	10,425
Auction Rate Securities [Member]
Fair Value	$ 23,504	$ 29,462	$ 31,457

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

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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

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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

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- 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.

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