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Net (Loss) Income Per Share (Tables)
 12 Months Ended
Jan. 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) income per share amounts:
 
Fiscal Year Ended January 31,
 
2016
 
2015
 
2014
Numerator:
 
 
 
 
 
Net (loss) income
$
(330.5
)
 
$
81.8

 
$
228.8

Denominator:
 
 
 
 
 
Denominator for basic net (loss) income per share—weighted average shares
226.0

 
227.1

 
224.0

Effect of dilutive securities (1)
—

 
5.3

 
5.6

Denominator for dilutive net (loss) income per share
226.0

 
232.4

 
229.6

Basic net (loss) income per share
$
(1.46
)
 
$
0.36

 
$
1.02

Diluted net (loss) income per share
$
(1.46
)
 
$
0.35

 
$
1.00


____________________ 
(1)
Dilutive securities of 4.7 million shares for the fiscal year ended January 31, 2016 have been excluded from the calculation of diluted net (loss) income per share as those shares would have been anti-dilutive due to the net loss incurred during this period.