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Financial Instruments - Effects of Derivative Instruments on Condensed Consolidated Statements of Operations (Detail) (Foreign Exchange Contracts, USD $)
In Millions, unless otherwise specified
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12 Months Ended |
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Jan. 31, 2014
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Jan. 31, 2013
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Designated as Hedging Instrument
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| Derivative Instruments, Gain (Loss) [Line Items] |
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| Amount of gain recognized in Accumulated other comprehensive income on derivatives (effective portion) |
$ 12.2 |
$ 5.1 |
| Amount and Location of Gain (Loss) Reclassified from Accumulated other comprehensive income into Income (Effective Portion) |
11.5 |
11.4 |
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Designated as Hedging Instrument | Net revenue
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| Derivative Instruments, Gain (Loss) [Line Items] |
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| Amount and Location of Gain (Loss) Reclassified from Accumulated other comprehensive income into Income (Effective Portion) |
13.1 |
16.0 |
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Designated as Hedging Instrument | Operating expenses
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| Derivative Instruments, Gain (Loss) [Line Items] |
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| Amount and Location of Gain (Loss) Reclassified from Accumulated other comprehensive income into Income (Effective Portion) |
(1.6) |
(4.6) |
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Designated as Hedging Instrument | Interest and other (expense) income, net
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| Derivative Instruments, Gain (Loss) [Line Items] |
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| Amount and Location of (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) |
(0.1) |
(0.2) |
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Not Designated as Hedging Instrument | Interest and other (expense) income, net
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| Derivative Instruments, Gain (Loss) [Line Items] |
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| Amount and Location of Gain Recognized in Income on Derivative |
$ 12.8 |
$ 1.5 |