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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ (23,451)	$ (15,427)
Other comprehensive income (loss) before reclassifications	9,573	3,104
Amounts reclassified from accumulated other comprehensive income (loss)	13	3
Net current-period other comprehensive income (loss)	9,586	3,107
Ending Balance	(13,865)	(12,320)
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(23,479)	(15,516)
Other comprehensive income (loss) before reclassifications	9,590	3,145
Net current-period other comprehensive income (loss)	9,590	3,145
Ending Balance	(13,889)	(12,371)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	28	89
Other comprehensive income (loss) before reclassifications	(17)	(41)
Amounts reclassified from accumulated other comprehensive income (loss)	13	3
Net current-period other comprehensive income (loss)	(4)	(38)
Ending Balance	$ 24	$ 51

X

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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