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Financial Instruments - Fair Value of Derivative Instruments (Detail) - USD ($) $ in Millions | Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2014
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Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Notional amount of foreign currency forward contracts not designated as cash flow hedges |  | $ 369.4 |  | $ 142.4 |  |
Net loss expected to be recognized into earnings |  | 733.6 |  | 1,619.6 | $ 2,219.2 | $ 2,261.5
Derivative asset, net |  | 13.3 |  | 8.3 |  |
Derivative liability, net |  | 10.5 |  | 6.4 |  |
Net Unrealized Gains (Losses) on Derivative Instruments |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Net loss expected to be recognized into earnings |  | 14.6 |  | 15.7 | $ 42.8 |
Foreign Exchange Contracts |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Notional amount of foreign currency forward contracts not designated as cash flow hedges |  | 270.6 |  | 231.6 |  |
Designated as Hedging Instrument | Foreign Exchange Contracts | Prepaid expenses and other current assets |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative asset, net |  | 10.1 |  | 3.4 |  |
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Accrued Liabilities |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative liability, net | [1] | 4.5 |  | 3.4 |  |
Not Designated as Hedging Instrument | Other assets |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative asset, net |  | 3.2 |  | 4.9 |  |
Not Designated as Hedging Instrument | Other Accrued Liabilities |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative liability, net |  | $ 6.0 | [1] | $ 3.0 |  |
[1] | Balance Sheet Location Fair Value at January 31, 2017 January 31, 2016Derivative Assets Foreign currency contracts designated as cash flow hedgesPrepaid expenses and other current assets $10.1 $3.4Derivatives not designated as hedging instrumentsPrepaid expenses and other current assets and Other assets 3.2 4.9Total derivative assets $13.3 $8.3Derivative Liabilities Foreign currency contracts designated as cash flow hedgesOther accrued liabilities $4.5 $3.4Derivatives not designated as hedging instrumentOther accrued liabilities 6.0 3.0Total derivative liabilities $10.5 $6.4

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226006-175313 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41678-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41678-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226006-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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