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Reconciliation of Beginning and Ending Auction Rate Securities Balances (Detail) (Fair Value, Inputs, Level 3, Auction Rate Securities, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011	Jan. 31, 2012
Fair Value, Inputs, Level 3 | Auction Rate Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 4,330	$ 26,716	$ 20,197	$ 29,462	$ 29,462
Total gains (losses) realized/unrealized, Included in earnings
Total gains (losses) realized/unrealized, Included in other comprehensive loss		413	2,183	767	1,010
Settlements		(3,625)	(18,050)	(6,725)	(10,275)
Transfers in and/or out of Level 3
Balance at end of period	4,330	23,504	4,330	23,504	20,197
Unrealized losses included in accumulated other comprehensive loss related to assets still held at reporting date	(595)	(3,021)	(595)	(3,021)	(2,778)
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

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- Definition

Unrealized Gain Loss Of Fair Value Assets Measured On Recurring Basis Available For Sale Securities Gross

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This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in other income. Such unrealized (holding) gains or losses relate to those assets still held at the reporting date for which fair value is measured on a recurring basis using 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

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Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).

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Amount of gain (loss) recognized in other comprehensive income, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).

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Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

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This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

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