Condensed Consolidated Statement of Other Comprehensive Income Parenthetical (USD $) In Millions, unless otherwise specified	3 Months Ended
Apr. 30, 2013	Apr. 30, 2012
Net gain (loss) on derivative instruments - tax effect:	$ 0.2	$ 0.6
Change in net unrealized gain on available-for-sale securities - tax effect:	0.2	0.6
Net change in cumulative foreign currency translation (loss) gain - tax effect:	$ 1.4	$ 2.0

Amount of tax effect, net of reclassification adjustments, on the result from the process of expressing in the reporting currency of the reporting entity those amounts that are denominated or measured in a different currency.

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

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

+ Details