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Net Income (Loss) Per Share (Tables) | 3 Months Ended
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Apr. 30, 2020
Earnings Per Share [Abstract] |
Schedule of computation of the numerators and denominators used in the basic and diluted net loss per share amounts | The following table sets forth the computation of the numerators and denominators used in the basic and diluted net income (loss) per share amounts:
| Three Months Ended April 30,
(in millions, except per share data) | 2020 |  | 2019
Numerator: |  |  |
Net income (loss) | $ | 66.5 |  |  | $ | (24.2 | )
Denominator: |  |  |
Denominator for basic net income (loss) per share—weighted average shares | 219.2 |  |  | 219.6 |
Effect of dilutive securities (1) | 2.1 |  |  | — |
Denominator for dilutive net income (loss) per share | 221.3 |  |  | 219.6 |
Basic net income (loss) per share | $ | 0.30 |  |  | $ | (0.11 | )
Diluted net income (loss) per share | $ | 0.30 |  |  | $ | (0.11 | )
____________________ (1) The effect of dilutive securities of 2.3 million shares in the three months ended April 30, 2019, has been excluded from the calculation of diluted net loss per share as those shares would have been anti-dilutive due to the net loss incurred in that period.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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