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Net Income Per Share (Tables)
 9 Months Ended
Oct. 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 per share amounts:

 
Three Months Ended October 31,
 
Nine Months Ended October 31,
 
2016
 
2015
 
2016
 
2015
Numerator:
 
 
 
 
 
 
 
Net loss
$
(142.8
)
 
$
(43.8
)
 
$
(408.7
)
 
$
(293.3
)
Denominator:
 
 
 
 
 
 
 
Denominator for basic net loss per share—weighted average shares
222.3

 
225.3

 
223.3

 
226.5

Effect of dilutive securities (1)
—

 
—

 
—

 
—

Denominator for dilutive net loss per share
222.3

 
225.3

 
223.3

 
226.5

Basic net loss per share
$
(0.64
)
 
$
(0.19
)
 
(1.83
)
 
$
(1.29
)
Diluted net loss per share
$
(0.64
)
 
$
(0.19
)
 
(1.83
)
 
$
(1.29
)

____________________ 
(1)
The effect of dilutive securities of 4.4 million shares and 3.4 million shares for the three months ended October 31, 2016 and 2015, 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 4.0 million shares in each of the nine months ended October 31, 2016 and 2015 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.