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Fair Value Of Financial Assets And Financial Liabilities (Financial Assets Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2011	Jan. 31, 2011	Oct. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis	$ 175,795	$ 468,408	$ 436,280
Corporate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis	81,407	137,559
Municipal And Pre-Refunded Municipal Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis	64,462	186,404	217,181
Federal Government Agencies [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis	2,001	59,175	75,787
Auction Rate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis	20,956	29,462	30,143
Treasury Bills [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis		30,353	39,565
Certificate Of Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis	6,969
FDIC Insured Corporate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis		23,555	41,679
Variable Rate Demand Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis		1,900	31,925
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis	90,377	250,642	157,031
Level 1 [Member] | Corporate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis	81,407	137,559
Level 1 [Member] | Federal Government Agencies [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis	2,001	59,175	75,787
Level 1 [Member] | Treasury Bills [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis		30,353	39,565
Level 1 [Member] | Certificate Of Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis	6,969
Level 1 [Member] | FDIC Insured Corporate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis		23,555	41,679
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis	64,462	188,304	249,106
Level 2 [Member] | Municipal And Pre-Refunded Municipal Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis	64,462	186,404	217,181
Level 2 [Member] | Variable Rate Demand Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis		1,900	31,925
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis	20,956	29,462	30,143
Level 3 [Member] | Auction Rate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets accounted for at fair value on a recurring basis	$ 20,956	$ 29,462	$ 30,143

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

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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