Expected Future Amortization Expense for Purchased Technologies, Customer Relationships and Trade Names (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
Oct. 31, 2011
Expected Amortization Expense [Line Items]
Remainder of 2012	$ 18.3
2013	63.6
2014	45.2
2015	24.6
2016	6.8
2017	1.0
Thereafter	1.6
Finite-Lived Intangible Assets, Future Amortization Expense, Total	$ 161.1

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The aggregate estimated amortization expense for succeeding fiscal years for intangible assets subject to amortization.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275

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- Definition

The amount of amortization expense expected to be recognized for the remainder of the finite-lived intangible asset useful life after the fifth succeeding fiscal year.

+ References

No definition available.

+ Details

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- Definition

The amount of amortization expense expected to be recognized during the remainder of the current fiscal year.

+ References

No definition available.

+ Details

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- Definition

The amount of amortization expense expected to be recognized during year five of the five succeeding fiscal years.

+ References

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- Definition

The amount of amortization expense expected to be recognized during year four of the five succeeding fiscal years.

+ References

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- Definition

The amount of amortization expense expected to be recognized during year one of the five succeeding fiscal years.

+ References

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The amount of amortization expense expected to be recognized during year three of the five succeeding fiscal years.

+ References

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The amount of amortization expense expected to be recognized during year two of the five succeeding fiscal years.

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