Net Income (Loss) Per Share (Tables)

12 Months Ended

Jan. 31, 2021

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,
	2021		2020		2019
Numerator:
Net income (loss)	$	1,208.2	$	214.5	$	(80.8)
Denominator:
Denominator for basic net income (loss) per share—weighted average shares	219.4		219.7		218.9
Effect of dilutive securities (1)	2.7		2.8		—
Denominator for dilutive net income (loss) per share	222.1		222.5		218.9
Basic net income (loss) per share	$	5.51	$	0.98	$	(0.37)
Diluted net income (loss) per share	$	5.44	$	0.96	$	(0.37)

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(1)The effect of dilutive securities of 3.1 million shares for the fiscal year ended January 31, 2019, 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 that fiscal year.