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Derivative Financial Instruments - Outstanding Currency, Forward Exchange Contracts (Detail) - Foreign Currency Forward Contracts [Member] - USD ($) $ in Thousands | Jan. 31, 2020 | Jan. 31, 2019
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Sell [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 292,257 | $ 395,395
Buy [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 476,416 | 525,360
Euro [Member] | Sell [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 227,292 | 335,775
Euro [Member] | Buy [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 118,275 | 204,537
British Pound [Member] | Sell [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 18,934 | 24,348
British Pound [Member] | Buy [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 54,818 | 66,809
Japanese Yen [Member] | Sell [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 37,429 | 28,009
Japanese Yen [Member] | Buy [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 58,672 | 47,997
Australian Dollar [Member] | Sell [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 345 | 786
Australian Dollar [Member] | Buy [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 7,817 | 8,012
Hong Kong Dollar [Member] | Sell [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 643 |
Hong Kong Dollar [Member] | Buy [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 152,452 | 121,578
Singapore Dollar [Member] | Sell [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 1,109 | 858
Singapore Dollar [Member] | Buy [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 15,987 | 15,115
Others [Member] | Sell [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 6,505 | 5,619
Others [Member] | Buy [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 68,395 | $ 61,312

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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