Net (Loss) Income Per Share (Tables)

12 Months Ended

Jan. 31, 2017

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,
	2017			2016			2015
Numerator:
Net (loss) income	$	(582.1	)	$	(330.5	)	$	81.8
Denominator:
Denominator for basic net (loss) income per share—weighted average shares	222.7			226.0			227.1
Effect of dilutive securities (1)	—			—			5.3
Denominator for dilutive net (loss) income per share	222.7			226.0			232.4
Basic net (loss) income per share	$	(2.61	)	$	(1.46	)	$	0.36
Diluted net (loss) income per share	$	(2.61	)	$	(1.46	)	$	0.35

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(1) The effect of dilutive securities of 4.6 million and 4.7 million shares for the fiscal year ended January 31, 2017 and 2016, respectively, 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 these fiscal years.