Fair Value (Tables)

12 Months Ended

Jan. 31, 2012

Financial Assets Measured At Fair Value On A Recurring Basis


	Marketable Securities Fair Value as of January 31, 2012
	Level 1		Level 2		Level 3		Total
Assets:
Corporate bonds	$	95,935	$	—	$	—	$	95,935
Municipal and pre-refunded municipal bonds		—		60,234		—		60,234
Auction rate securities		—		—		20,197		20,197
Treasury bills		14,988		—		—		14,988
Certificates of deposit		—		12,194		—		12,194
Federal government agencies		9,627		—		—		9,627
Commercial paper		—		3,592		—		3,592

	$	120,550	$	76,020	$	20,197	$	216,767

	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
Auction rate securities		—		—		29,462		29,462
Treasury bills		30,353		—		—		30,353
Federal government agencies		59,175		—		—		59,175
FDIC insured corporate bonds		23,555		—		—		23,555
Variable rate demand notes		—		1,900		—		1,900

	$	250,642	$	188,304	$	29,462	$	468,408

Reconciliation Of Beginning And Ending ARS Balances


	Fiscal Year Ended January 31, 2012			Fiscal Year Ended January 31, 2011
Balance at beginning of period	$	29,462		$	33,505
Total gains (losses) realized/unrealized:
Included in earnings		—			—
Included in comprehensive income		1,010			332
Settlements		(10,275	)		(4,375	)
Transfers in and/or out of Level 3		—			—

Balance at end of period	$	20,197		$	29,462

Unrealized losses included in accumulated other comprehensive loss related to assets still held at reporting date	$	(2,778	)	$	(3,788	)
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	$	—		$	—

- 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).

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- 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.

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