Contractual Maturities of Types of Securities (Detail) (USD $) In Millions, unless otherwise specified	Jan. 31, 2012
Cost
Due in less than 1 year	$ 222.8
Due in 1 year through 5 years	205.7
Due in 5 years through 10 years	0
Due after 10 years	4.2
Total	432.7
Fair Value
Due in less than 1 year	222.9
Due in 1 year through 5 years	206.9
Due in 5 years through 10 years	0
Due after 10 years	4.2
Total	$ 434.0

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