Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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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.

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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Financial Instruments - Derivative Narrative and Fair Value of Derivative Instruments (Detail) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Derivatives, Fair Value [Line Items]
Notional amount of foreign currency forward contracts not designated as cash flow hedges	$ 803.5	$ 619.9
Net loss expected to be recognized into earnings	(210.9)	(256.0)	$ 733.6	$ 1,619.6
Derivative asset, net	8.5	8.2
Derivative liability, net	7.4	26.6
Net Unrealized Gains (Losses) on Derivative Instruments
Derivatives, Fair Value [Line Items]
Net loss expected to be recognized into earnings	15.0	(16.6)	$ 14.6
Foreign Exchange Contracts
Derivatives, Fair Value [Line Items]
Notional amount of foreign currency forward contracts not designated as cash flow hedges	579.8	329.6
Designated as Hedging Instrument \| Foreign Exchange Contracts \| Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, net	4.3	6.2
Designated as Hedging Instrument \| Foreign Exchange Contracts \| Other accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, net	3.3	18.7
Not Designated as Hedging Instrument \| Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, net	4.2	2.0
Not Designated as Hedging Instrument \| Other accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, net	$ 4.1	$ 7.9
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