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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Business and Summary of Significant Accounting Policies - Change in Presentation (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Maintenance									$ 989.6	$ 1,103.1	$ 1,152.5
Subscription									894.3	443.1	228.1
License and other									172.7	484.8	1,123.5
Total net revenue	$ 553.8	$ 515.3	$ 501.8	$ 485.7	$ 478.8	$ 489.6	$ 550.7	$ 511.9	2,056.6	2,031.0	2,504.1
Maintenance and subscription									214.4	191.7	162.3
License and other									72.6	110.2	159.4
Amortization of developed technology									16.4	40.0	49.0
Total cost of revenue									$ 303.4	341.9	370.7
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Subscription										1,290.0	1,277.2
License and other										741.0	1,226.9
Total net revenue										2,031.0	2,504.1
Maintenance and subscription										151.3	156.1
License and other										190.6	214.6
Total cost of revenue										341.9	370.7
Change in Presentation Reclassification
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Maintenance										1,103.1	1,152.5
Subscription										(846.9)	(1,049.1)
License and other										(256.2)	(103.4)
Total net revenue										0.0	0.0
Maintenance and subscription										40.4	6.2
License and other										(80.4)	(55.2)
Amortization of developed technology										40.0	49.0
Total cost of revenue										$ 0.0	$ 0.0