Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature more than one year from the balance sheet date or operating cycle, if longer.

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+ Details

- Definition

Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).

+ References

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+ Details

Cost and Fair Value of Financial Instruments (Detail) (USD $) In Millions	Jul. 31, 2011	Jan. 31, 2011	Jul. 31, 2010	Jan. 31, 2010
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cash and cash equivalents	$ 1,131.5	$ 1,075.1	$ 850.0	$ 838.7
Marketable securities - short-term	241.8	199.2
Marketable securities - long-term	179.2	192.6
Amortized Cost
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cash and cash equivalents	1,131.5	1,075.1
Marketable securities - short-term	239.5	197.5
Marketable securities - long-term	177.1	190.8
Convertible debt securities	14.5
Foreign currency forward and option contracts	5.3	3.9
Fair Value
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cash and cash equivalents	1,131.5	1,075.1
Marketable securities - short-term	241.8	199.2
Marketable securities - long-term	179.2	192.6
Convertible debt securities	14.5
Foreign currency forward and option contracts	$ 4.3	$ 3.9