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Net (Loss) Income Per Share (Tables) | 12 Months Ended
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Jan. 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) income per share amounts:
| Fiscal Year Ended January 31,
| 2017 |  | 2016 |  | 2015
Numerator: |  |  |  |  |
Net (loss) income | $ | (582.1 | ) |  | $ | (330.5 | ) |  | $ | 81.8 |
Denominator: |  |  |  |  |
Denominator for basic net (loss) income per share—weighted average shares | 222.7 |  |  | 226.0 |  |  | 227.1 |
Effect of dilutive securities (1) | — |  |  | — |  |  | 5.3 |
Denominator for dilutive net (loss) income per share | 222.7 |  |  | 226.0 |  |  | 232.4 |
Basic net (loss) income per share | $ | (2.61 | ) |  | $ | (1.46 | ) |  | $ | 0.36 |
Diluted net (loss) income per share | $ | (2.61 | ) |  | $ | (1.46 | ) |  | $ | 0.35 |
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(1) | The effect of dilutive securities of 4.6 million and 4.7 million shares for the fiscal year ended January 31, 2017 and 2016, respectively, have been excluded from the calculation of diluted net (loss) income per share as those shares would have been anti-dilutive due to the net loss incurred during these fiscal years.

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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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