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Derivative Instruments - Gains (losses) Associated with Foreign Currency Forward Contracts (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 30, 2018 | Apr. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative instruments, gain (loss) expected to be reclassified from accumulated OCI within the next 12 months | $ (9,000) |
Other income (expense), net |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Foreign currency forward contracts not designated as hedges | 1,794 | $ (6)
Designated as Hedging Instrument | Revenues |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) reclassified from OCI into income (effective portion) | (1,117) | 234
Designated as Hedging Instrument | Other income (expense), net |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) recognized in income (amount excluded from effectiveness testing and ineffective portion) | 2,231 | 623
Designated as Hedging Instrument | Net change in market value of effective foreign currency forward exchange contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) recognized in OCI (effective portion) | $ 18,274 | $ (975)

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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