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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		9 Months Ended		12 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012	Jan. 31, 2013
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	$ 4,330	$ 20,197	$ 20,197
Total gains (losses) realized/unrealized, Included in earnings			(345)
Total gains (losses) realized/unrealized, Included in other comprehensive income			595	2,183	2,183
Settlements			(4,580)	(18,050)	(18,050)
Transfers in and/or out of Level 3
Balance at end of period		4,330		4,330	4,330
Unrealized losses included in accumulated other comprehensive loss related to assets still held at reporting date		(595)		(595)	(595)
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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Unrealized Gain Loss Of Fair Value Assets Measured On Recurring Basis Available For Sale Securities Gross

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Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related 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).

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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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