Computer Equipment, Software, Furniture and Leasehold Improvements, Net (Details) (USD $) In Millions, unless otherwise specified	Apr. 30, 2013	Jan. 31, 2013
Property, Plant and Equipment [Abstract]
Computer software, at cost	$ 96.2	$ 95.1
Computer hardware, at cost	156.2	152.3
Leasehold improvements, land and buildings, at cost	169.3	152.4
Furniture and equipment, at cost	48.2	46.0
Property, Plant and Equipment, Gross, Total	469.9	445.8
Less: Accumulated depreciation	(340.9)	(330.9)
Computer software, hardware, leasehold improvements, furniture and equipment, net	$ 129.0	$ 114.9

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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