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Discounted Operations (Detail) - Schedule of Disposal Groups Including Discontinued Operations (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Net sales and revenue	$ 258	$ 597
Cost of sales	9	125
Income before income taxes	179	281
Provision for income taxes	(70)	(112)
Income from discontinued operations, net of tax	109	169
Gain (loss) on disposal	215	(14)
(Provision) benefit for income taxes	(84)	6
Gain (loss) on disposal of discontinued operations, net of tax	$ 131	$ (8)

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Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Tax benefit from provision recognizing a loss for initial, or subsequent, write-down to fair value (less cost to sell) of a of a disposal group that is classified as a component of the entity, which remains unsold as of the reporting date. May include a tax on the (gain) for the recognition of a subsequent increase in fair value (less cost to sell), but not in excess of the cumulative loss previously recognized through write-downs.

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Amount of costs of goods sold attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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