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Net Income (Loss) Per Share (Tables)
 12 Months Ended
Jan. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Calculation of Numerator and Denominator in Net Loss Per Share The following table sets forth the computation of the numerators and denominators used in the basic and diluted net income (loss) per share amounts:
 
Fiscal Year Ended January 31,
 
2020
 
2019
 
2018
Numerator:
 
 
 
 
 
Net income (loss)
$
214.5

 
$
(80.8
)
 
$
(566.9
)
Denominator:
 
 
 
 
 
Denominator for basic net income (loss) per share—weighted average shares
219.7

 
218.9

 
219.5

Effect of dilutive securities (1)
2.8

 
—

 
—

Denominator for dilutive net income (loss) per share
222.5

 
218.9

 
219.5

Basic net income (loss) per share
$
0.98

 
$
(0.37
)
 
$
(2.58
)
Diluted net income (loss) per share
$
0.96

 
$
(0.37
)
 
$
(2.58
)

____________________ 
(1)
The effect of dilutive securities of 3.1 million and 4.5 million shares for the fiscal years ended January 31, 2019 and 2018, 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.