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Net Loss Per Share (Tables)
 12 Months Ended
Jan. 31, 2018
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:
 
Fiscal Year Ended January 31,
 
2018
 
2017
 
2016
Numerator:
 
 
 
 
 
Net loss
$
(566.9
)
 
$
(582.1
)
 
$
(330.5
)
Denominator:
 
 
 
 
 
Denominator for basic net loss per share—weighted average shares
219.5

 
222.7

 
226.0

Effect of dilutive securities (1)
—

 
—

 
—

Denominator for dilutive net loss per share
219.5

 
222.7

 
226.0

Basic net loss per share
$
(2.58
)
 
$
(2.61
)
 
$
(1.46
)
Diluted net loss per share
$
(2.58
)
 
$
(2.61
)
 
$
(1.46
)

____________________ 
(1)
The effect of dilutive securities of 4.5 million, 4.6 million, and 4.7 million shares for the fiscal year ended January 31, 2018, 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 fiscal years.