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Net (Loss) Income Per Share (Tables)
 6 Months Ended
Jul. 31, 2015
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:

 
Three Months Ended July 31,
 
Six Months Ended July 31,
 
2015
 
2014
 
2015
 
2014
Numerator:
 
 
 
 
 
 
 
Net (loss) income
$
(235.5
)
 
$
31.3

 
$
(216.4
)
 
$
59.6

Denominator:
 
 
 
 
 
 
 
Denominator for basic net (loss) income per share—weighted average shares
227.0

 
227.3

 
227.1

 
227.1

Effect of dilutive securities (1)
—

 
5.1

 
—

 
5.3

Denominator for dilutive net (loss) income per share
227.0

 
232.4

 
227.1

 
232.4

Basic net (loss) income per share
$
(1.04
)
 
$
0.14

 
$
(0.95
)
 
$
0.26

Diluted net (loss) income per share
$
(1.04
)
 
$
0.13

 
$
(0.95
)
 
$
0.26