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Financial Instruments - Fair Value of Derivative Instruments (Detail) (USD $)
In Millions, unless otherwise specified |
Jan. 31, 2014
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Jan. 31, 2013
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| Derivatives, Fair Value [Line Items] | ||||||||
| Derivative asset, net | $ 21.3 | $ 17.4 | ||||||
| Derivative liability, net | 1.7 | 3.9 | ||||||
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Designated as Hedging Instrument | Foreign Exchange Contracts | Prepaid expenses and other current assets
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| Derivatives, Fair Value [Line Items] | ||||||||
| Derivative asset, net | 4.4 | [1] | 6.7 | [1] | ||||
| Derivative asset, gross | 5.9 | 8.2 | ||||||
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Designated as Hedging Instrument | Foreign Exchange Contracts | Other Accrued Liabilities
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| Derivatives, Fair Value [Line Items] | ||||||||
| Derivative liability, net | 1.7 | [2] | 3.9 | [2] | ||||
| Derivative liability, gross | 3.2 | 5.4 | ||||||
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Not Designated as Hedging Instrument | Other assets
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| Derivatives, Fair Value [Line Items] | ||||||||
| Derivative asset, net | $ 16.9 | $ 10.7 | ||||||
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