Available for Sale Securities (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Jan. 31, 2013	Jan. 31, 2011	Jan. 31, 2012
Investments, All Other Investments [Abstract]
Equity method investment, other than temporary impairment	$ 10.5
Available-for-sale securities gross gains (losses)	5.0	1.7
Notional amount of foreign currency option collar and forward contracts designated as cash flow hedges	359.8		419.6
Net loss expected to be recognized into earnings	(2.8)	0.8	(9.2)
Notional amount of foreign currency forward contracts not designated as cash flow hedges	$ 78.4		$ 75.1

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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