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Net Loss Per Share (Tables) | 6 Months Ended
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Jul. 31, 2017
Earnings Per Share [Abstract] |
Schedule of Calculation of Numerator and Denominator in Earnings Per Share | The following table sets forth the computation of the numerators and denominators used in the basic and diluted net loss per share amounts:
| Three Months Ended July 31, |  | Six Months Ended July 31,
| 2017 |  | 2016 |  | 2017 |  | 2016
Numerator: |  |  |  |  |  |  |
Net loss | $ | (144.0 | ) |  | $ | (98.2 | ) |  | $ | (273.6 | ) |  | $ | (265.9 | )
Denominator: |  |  |  |  |  |  |
Denominator for basic net loss per share—weighted average shares | 219.5 |  |  | 223.2 |  |  | 219.7 |  |  | 223.8 |
Effect of dilutive securities (1) | — |  |  | — |  |  | — |  |  | — |
Denominator for dilutive net loss per share | 219.5 |  |  | 223.2 |  |  | 219.7 |  |  | 223.8 |
Basic net loss per share | $ | (0.66 | ) |  | $ | (0.44 | ) |  | $ | (1.25 | ) |  | $ | (1.19 | )
Diluted net loss per share | $ | (0.66 | ) |  | $ | (0.44 | ) |  | $ | (1.25 | ) |  | $ | (1.19 | )
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(1) | The effect of dilutive securities of 4.8 million and 4.2 million shares in the three months ended July 31, 2017 and 2016, respectively, have 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 during those periods. The effect of dilutive securities of 4.7 million and 4.0 million shares in the six months ended July 31, 2017 and 2016, respectively, have 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 during those periods.

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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