Contractual Maturities of Types of Securities (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2013
Cost
Due in less than 1 year	$ 306.7
Due in 1 year through 5 years	423.2
Due in 5 years through 10 years	0
Due after 10 years	4.2
Total	734.1
Fair Value
Due in less than 1 year	306.8
Due in 1 year through 5 years	424.4
Due in 5 years through 10 years	0
Due after 10 years	4.2
Total	$ 735.4

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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