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Financial Instruments - Derivative Narrative and Fair Value of Derivative Instruments (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Jan. 31, 2020 | Jan. 31, 2019
Derivatives, Fair Value [Line Items] |  |
Derivative, notional amount | $ 981.3 | $ 803.5
Net gain expected to be recognized into earnings | 8.4 |
Derivative asset, net | 9.4 | 8.5
Derivative liability, net | 4.7 | 7.4
Foreign Exchange Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, notional amount | 736.2 | 579.8
Designated as Hedging Instrument | Foreign Exchange Contracts | Prepaid expenses and other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, net | 1.0 | 4.3
Designated as Hedging Instrument | Foreign Exchange Contracts | Other accrued liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, net | 2.8 | 3.3
Not Designated as Hedging Instrument | Prepaid expenses and other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, net | 8.4 | 4.2
Not Designated as Hedging Instrument | Other accrued liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, net | $ 1.9 | $ 4.1
Minimum | Foreign Exchange Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, term of contract | 1 month |
Maximum | Foreign Exchange Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, term of contract | 12 months |

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- Definition Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226006-175313 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 + Details
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