Basis of Presentation Revenue Reclassification (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Net revenue:
Maintenance	$ 244.4	$ 273.2	$ 769.8	$ 835.1
Subscription	231.1	112.4	600.6	299.7
License and other	39.8	104.0	132.4	417.4
Total net revenue	515.3	489.6	1,502.8	1,552.2
Cost of revenue:
Maintenance and subscription	53.9	46.8	161.6	140.2
License and other	19.6	24.3	56.0	86.8
Amortization of developed technology	4.0	10.4	12.7	32.0
Total cost of revenue	$ 77.5	81.5	$ 230.3	259.0
Previously Reported
Net revenue:
Subscription		319.5		967.5
License and other		170.1		584.7
Total net revenue		489.6		1,552.2
Cost of revenue:
Maintenance and subscription		35.1		113.1
License and other		46.4		145.9
Total cost of revenue		81.5		259.0
Change in Presentation Reclassification
Net revenue:
Maintenance		273.2		835.1
Subscription		(207.1)		(667.8)
License and other		(66.1)		(167.3)
Total net revenue		0.0		0.0
Cost of revenue:
Maintenance and subscription		11.7		27.1
License and other		(22.1)		(59.1)
Amortization of developed technology		10.4		32.0
Total cost of revenue		$ 0.0		$ 0.0

Cost of Goods Sold, Subscription and Maintenance

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The amount of expense recognized in the current period that reflects the allocation of the costs of intangible assets over the expected benefit period of such assets. This element applies only to intangible assets used in the production of goods.

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The aggregate cost of goods produced and sold and services rendered during the reporting period.

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Revenue from multiple-deliverable arrangements that include licensing fees and services revenue. Licensing revenue is consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity. Services revenue may be derived by providing other, nonspecified, services during the reporting period.

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Costs incurred and are directly related to generating license revenue. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark.

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Revenue derived from maintenance services provided under contracts or arrangements with clients. For example, it may include the maintenance of software, plant and equipment, and facilities.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Revenue from circulation or sale of subscriptions (for example, but not limited to, subscriptions to a magazine or newspaper).

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