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Net (Loss) Income Per Share (Tables) | 12 Months Ended
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Jan. 31, 2016
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,
| 2016 |  | 2015 |  | 2014
Numerator: |  |  |  |  |
Net (loss) income | $ | (330.5 | ) |  | $ | 81.8 |  |  | $ | 228.8 |
Denominator: |  |  |  |  |
Denominator for basic net (loss) income per share—weighted average shares | 226.0 |  |  | 227.1 |  |  | 224.0 |
Effect of dilutive securities (1) | — |  |  | 5.3 |  |  | 5.6 |
Denominator for dilutive net (loss) income per share | 226.0 |  |  | 232.4 |  |  | 229.6 |
Basic net (loss) income per share | $ | (1.46 | ) |  | $ | 0.36 |  |  | $ | 1.02 |
Diluted net (loss) income per share | $ | (1.46 | ) |  | $ | 0.35 |  |  | $ | 1.00 |
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(1) | Dilutive securities of 4.7 million shares for the fiscal year ended January 31, 2016 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 this 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/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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