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Financial Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2019 | Jul. 31, 2018 | Jan. 31, 2019
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative assets | $ 11.6 |  | $ 11.6 |  | $ 8.5
Derivative liabilities | 5.9 |  | 5.9 |  | 7.4
Foreign currency contracts | Designated as hedging instrument |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Amount of gain recognized in accumulated other comprehensive loss on derivatives (effective portion) | (0.9) |  | 3.1 |  |
Amount of gain recognized in accumulated other comprehensive loss on derivatives (effective portion) |  | $ 6.4 |  | $ 13.3 |
Amount of gain (loss) reclassified from accumulated other comprehensive loss into income (loss) (effective portion) | 3.4 |  | 4.1 |  |
Amount of gain (loss) reclassified from accumulated other comprehensive loss into income (loss) (effective portion) |  | (5.1) |  | (4.3) |
Foreign currency contracts | Designated as hedging instrument | Prepaid expenses and other current assets |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative assets | 6.1 |  | 6.1 |  | 4.3
Foreign currency contracts | Designated as hedging instrument | Other accrued liabilities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative liabilities | 2.6 |  | 2.6 |  | 3.3
Foreign currency contracts | Derivatives not designated as hedging instruments | Prepaid expenses and other current assets |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative assets | 5.5 |  | 5.5 |  | 4.2
Foreign currency contracts | Derivatives not designated as hedging instruments | Other accrued liabilities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative liabilities | 3.3 |  | 3.3 |  | $ 4.1
Net revenue | Foreign currency contracts | Designated as hedging instrument |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Amount of gain (loss) reclassified from accumulated other comprehensive loss into income (loss) (effective portion) | 5.0 |  | 8.5 |  |
Amount of gain (loss) reclassified from accumulated other comprehensive loss into income (loss) (effective portion) |  | (3.5) |  | (6.0) |
Cost of revenue | Foreign currency contracts | Designated as hedging instrument |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Amount of gain (loss) reclassified from accumulated other comprehensive loss into income (loss) (effective portion) | (0.2) |  | (0.3) |  |
Amount of gain (loss) reclassified from accumulated other comprehensive loss into income (loss) (effective portion) |  | 0.0 |  | 0.0 |
Operating expenses | Foreign currency contracts | Designated as hedging instrument |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Amount of gain (loss) reclassified from accumulated other comprehensive loss into income (loss) (effective portion) | (1.4) |  | (4.1) |  |
Amount of gain (loss) reclassified from accumulated other comprehensive loss into income (loss) (effective portion) |  | (1.6) |  | 1.7 |
Interest and other (expense) income, net | Foreign currency contracts | Designated as hedging instrument |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Amount of (loss) gain recognized in (loss) income on derivatives (ineffective portion and amount excluded from effectiveness testing) | (2.5) |  | 1.3 |  |
Amount of (loss) gain recognized in (loss) income on derivatives (ineffective portion and amount excluded from effectiveness testing) |  | 0.7 |  | 0.5 |
Interest and other (expense) income, net | Foreign currency contracts | Derivatives not designated as hedging instruments |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Amount and location of gain recognized on derivatives in net (loss) income | $ (2.4) | $ 1.4 | $ 1.7 | $ 6.0 |

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- Definition Fair value, after offset of derivative asset, of financial liability or 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, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities 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 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 Reference 2: 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 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 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=109977999&loc=d3e76258-113986 + Details
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