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Acquisitions (Summary of Fair Value of Assets Acquired and Liabilities Assumed by Major Class) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Jan. 31, 2020 | Jan. 31, 2019
Business Acquisition [Line Items] |  |
Goodwill | $ 2,445.0 | $ 2,450.8
Fiscal 2019 Acquisitions |  |
Business Acquisition [Line Items] |  |
Goodwill | 868.0 |
Deferred revenue (current and non-current) | (30.0) |
Net tangible assets | 25.0 |
Total | 1,124.4 |
Fiscal 2019 Acquisitions | Developed technologies |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 94.9 |
Fiscal 2019 Acquisitions | Customer relationships and other non-current intangible assets |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 136.9 |
Fiscal 2019 Acquisitions | Trade name |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 29.6 |
Assemble Systems Inc |  |
Business Acquisition [Line Items] |  |
Goodwill | 71.8 |
Deferred revenue (current and non-current) | 1.7 |
Net tangible assets | 4.3 |
Total | 93.6 |
Goodwill, measurement period adjustment | 0.2 |
Net tangible assets, measurement period adjustment | (0.2) |
Assemble Systems Inc | Developed technologies |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 4.4 |
Assemble Systems Inc | Customer relationships and other non-current intangible assets |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 12.0 |
Assemble Systems Inc | Trade name |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 2.8 |
PlanGrid |  |
Business Acquisition [Line Items] |  |
Goodwill | 589.5 |
Deferred revenue (current and non-current) | 25.5 |
Net tangible assets | 17.6 |
Total | 777.6 |
Goodwill, measurement period adjustment | 0.8 |
PlanGrid | Developed technologies |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 78.0 |
PlanGrid | Customer relationships and other non-current intangible assets |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 98.0 |
PlanGrid | Trade name |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 20.0 |
BuildingConnected, Inc. |  |
Business Acquisition [Line Items] |  |
Goodwill | 206.7 |
Deferred revenue (current and non-current) | 2.8 |
Net tangible assets | 3.1 |
Total | 253.2 |
Goodwill, measurement period adjustment | 0.4 |
BuildingConnected, Inc. | Developed technologies |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 12.5 |
BuildingConnected, Inc. | Customer relationships and other non-current intangible assets |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 26.9 |
BuildingConnected, Inc. | Trade name |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | $ 6.8 |

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