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Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jul. 31, 2013	Jul. 31, 2013	Jul. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ (10,869)	$ (8,782)	$ (9,415)
Other comprehensive income/(loss) before reclassifications	(2,136)	(4,437)
Amounts reclassified from accumulated other comprehensive loss	(12)	202
Net current-period other comprehensive income/(loss)	(2,148)	(4,235)
Ending Balance	(13,017)	(13,017)	(9,415)
Accumulated Translation Adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(11,059)	(8,582)
Other comprehensive income/(loss) before reclassifications	(1,938)	(4,415)
Net current-period other comprehensive income/(loss)	(1,938)	(4,415)
Ending Balance	(12,997)	(12,997)
Accumulated Net Unrealized Investment Gain (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	190	(200)
Other comprehensive income/(loss) before reclassifications	(198)	(22)
Amounts reclassified from accumulated other comprehensive loss	(12)	202
Net current-period other comprehensive income/(loss)	(210)	180
Ending Balance	$ (20)	$ (20)

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14A

-URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



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

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