Fair Value of Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jul. 31, 2012	Jul. 31, 2011
Fair Value Measurements [Line Items]
Net unrealized gain on foreign currency forward contracts	$ 7.2	$ 5.5
Net unrealized loss on foreign currency forward contracts	12.3	13.6
Fair value of the Company's nonqualified deferred compensation plan investments	33.0
Fair value of the Company's nonqualified deferred compensation plan related liability	$ 30.6

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Unrealized gain on foreign currency derivatives, foreign exchange receivable

+ References

No definition available.

+ Details

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- Definition

Unrealized loss on foreign currency derivatives, foreign exchange payable

+ References

No definition available.

+ Details

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

No definition available.

+ Details

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- Definition

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

+ 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 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5

+ Details

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