Acquisitions - Summary of Fair Value of Assets Acquired and Liabilities Assumed by Major Class (Details) - USD ($) $ in Millions	Jul. 31, 2021	Jan. 31, 2021
Business Acquisition [Line Items]
Goodwill	$ 3,562.2	$ 2,706.5
Innovyze, Inc.
Business Acquisition [Line Items]
Goodwill	767.2
Deferred revenue and long-term deferred revenue	(12.3)
Long-term deferred income taxes	(42.4)
Net tangible assets	7.3
Total	1,038.3
Upchain
Business Acquisition [Line Items]
Goodwill	98.3
Deferred revenue and long-term deferred revenue	(2.6)
Long-term deferred income taxes	(0.7)
Net tangible assets	0.2
Total	123.6
Innovyze, Inc. And Upchain
Business Acquisition [Line Items]
Goodwill	865.5
Deferred revenue and long-term deferred revenue	(14.9)
Long-term deferred income taxes	(43.1)
Net tangible assets	7.5
Total	1,161.9
Developed technologies | Innovyze, Inc.
Business Acquisition [Line Items]
Finite-lived intangibles	93.0
Developed technologies | Upchain
Business Acquisition [Line Items]
Finite-lived intangibles	17.6
Developed technologies | Innovyze, Inc. And Upchain
Business Acquisition [Line Items]
Finite-lived intangibles	110.6
Customer relationships | Innovyze, Inc.
Business Acquisition [Line Items]
Finite-lived intangibles	221.0
Customer relationships | Upchain
Business Acquisition [Line Items]
Finite-lived intangibles	10.4
Customer relationships | Innovyze, Inc. And Upchain
Business Acquisition [Line Items]
Finite-lived intangibles	231.4
Trade name | Innovyze, Inc.
Business Acquisition [Line Items]
Finite-lived intangibles	4.0
Trade name | Upchain
Business Acquisition [Line Items]
Finite-lived intangibles	0.4
Trade name | Innovyze, Inc. And Upchain
Business Acquisition [Line Items]
Finite-lived intangibles	4.4
Backlog | Innovyze, Inc.
Business Acquisition [Line Items]
Finite-lived intangibles	0.5
Backlog | Upchain
Business Acquisition [Line Items]
Finite-lived intangibles	0.0
Backlog | Innovyze, Inc. And Upchain
Business Acquisition [Line Items]
Finite-lived intangibles	$ 0.5