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Net Income (Loss) Per Share (Tables)
 6 Months Ended
Jul. 31, 2019
Earnings Per Share [Abstract]  
Schedule of computation of the numerators and denominators used in the basic and diluted net loss per share amounts The following table sets forth the computation of the numerators and denominators used in the basic and diluted net income (loss) per share amounts:

 
Three Months Ended July 31,
 
Six Months Ended July 31,
 
2019
 
2018
 
2019
 
2018
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
40.2

 
$
(39.4
)
 
$
16.0

 
$
(121.8
)
Denominator:
 
 
 
 
 
 
 
Denominator for basic net income (loss) per share—weighted average shares
219.6

 
219.0

 
219.6

 
218.8

Effect of dilutive securities (1)
2.8

 
—

 
2.7

 
—

Denominator for dilutive net income (loss) per share
222.4

 
219.0

 
222.3

 
218.8

Basic net income (loss) per share
$
0.18

 
$
(0.18
)
 
$
0.07

 
$
(0.56
)
Diluted net income (loss) per share
$
0.18

 
$
(0.18
)
 
$
0.07

 
$
(0.56
)

____________________ 
(1)
The effect of dilutive securities of 3.2 million and 3.3 million shares in the three and six months ended July 31, 2018, respectively, have been excluded from the calculation of diluted net income (loss) per share as those shares would have been anti-dilutive due to the net loss incurred during those periods.