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Fair Value Of Financial Assets And Financial Liabilities (Tables)

6 Months Ended

Jul. 31, 2011

Fair Value Of Financial Assets And Financial Liabilities

Financial Assets Measured At Fair Value On A Recurring Basis

		Marketable Securities Fair Value as of July 31, 2011
		Level 1				Level 2				Level 3				Total
Assets:
Corporate bonds		$	145,121			$	—			$	—			$	145,121
Municipal and pre-refunded municipal bonds			—				124,343				—				124,343
Federal government agencies			57,404				—				—				57,404
Auction rate securities			—				—				23,504				23,504
Treasury bills			19,829				—				—				19,829
Certificate of deposit			5,143				—				—				5,143
FDIC insured corporate bonds			4,004				—				—				4,004
Variable demand notes			—				2,901				—				2,901
		$	231,501			$	127,244			$	23,504			$	382,249

		Marketable Securities Fair Value as of January 31, 2011
		Level 1				Level 2				Level 3				Total
Assets:
Corporate bonds		$	137,559			$	—			$	—			$	137,559
Municipal and pre-refunded municipal bonds			—				186,404				—				186,404
Federal government agencies			59,175				—				—				59,175
Auction rate securities			—				—				29,462				29,462
Treasury bills			30,353				—				—				30,353
FDIC insured corporate bonds			23,555				—				—				23,555
Variable demand notes			—				1,900				—				1,900
		$	250,642			$	188,304			$	29,462			$	468,408

		Marketable Securities Fair Value as of July 31, 2010
		Level 1				Level 2				Level 3				Total
Assets:
Municipal and pre-refunded municipal bonds		$	—			$	195,784			$	—			$	195,784
Federal government agencies			174,550				—				—				174,550
Auction rate securities			—				—				31,457				31,457
Treasury bills			49,667				—				—				49,667
FDIC insured corporate bonds			41,831				—				—				41,831
Variable rate demand notes			—				10,425			$	—				10,425
		$	266,048			$	206,209			$	31,457			$	503,714

Reconciliation Of Beginning And Ending ARS Balances

		Three Months Ended July 31, 2011				Fiscal Year Ended January 31, 2011				Three Months Ended July 31, 2010
Balance at beginning of period		$	26,716			$	33,505			$	33,505
Total gains or (losses) realized/unrealized:
Included in earnings			—				—				—
Included in other comprehensive income			413				332				252
Settlements			(3,625	)			(4,375	)			(2,300	)
Transfers in and/or out of Level 3			—				—				—
Balance at end of period		$	23,504			$	29,462			$	31,457
Unrealized losses included in accumulated other comprehensive loss related to assets still held at reporting date		$	(3,021	)		$	(3,788	)		$	(3,868	)
Total gains for the period included in earnings attributable to the change in unrealized gains or losses related to assets still held at reporting date		$	—			$	—			$	—

		Six Months Ended July 31, 2011				Six Months Ended July 31, 2010
Balance at beginning of period		$	29,462			$	33,505
Total gains or (losses) realized/unrealized:
Included in earnings			—				—
Included in other comprehensive income			767				252
Settlements			(6,725	)			(2,300	)
Transfers in and/or out of Level 3			—				—
Balance at end of period		$	23,504			$	31,457
Unrealized losses included in accumulated other comprehensive loss related to assets still held at reporting date		$	(3,021	)		$	(3,868	)
Total gains for the period included in earnings attributable to the change in unrealized gains or losses related to assets still held at reporting date		$	—			$	—

X

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19190-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-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 Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 6
-Footnote 4
-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 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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X

- Definition

Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph c
-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 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19279-110258

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