Net Income per Share Attributable to Common Stockholders (Tables)

6 Months Ended

Jul. 31, 2018

Earnings Per Share [Abstract]

Numerators and Denominators of the Basic and Diluted EPS Computations for Common Stock

The numerators and denominators of the basic and diluted EPS computations for our common stock are calculated as follows (in thousands, except per share data):

	Three Months Ended July 31,								Six Months Ended July 31,
	2018				2017				2018				2017
					*As adjusted								*As adjusted
	Class A		Class B		Class A		Class B		Class A		Class B		Class A		Class B
Basic
Numerator
Net income	$	42,326	$	7,960	$	30,820	$	7,782	$	79,137	$	15,459	$	59,243	$	16,355
Undistributed earnings allocated to    participating securities		—		—		—		—		—		—		—		—
Net income attributable to common    stockholders, basic	$	42,326	$	7,960	$	30,820	$	7,782	$	79,137	$	15,459	$	59,243	$	16,355
Denominator
Weighted average shares used in    computing net income per share    attributable to common    stockholders, basic		120,994		22,754		111,786		28,224		119,857		23,414		109,204		30,147
Net income per share attributable to    common stockholders, basic	$	0.35	$	0.35	$	0.28	$	0.28	$	0.66	$	0.66	$	0.54	$	0.54
Diluted
Numerator
Net income attributable to    common stockholders, basic	$	42,326	$	7,960	$	30,820	$	7,782	$	79,137	$	15,459	$	59,243	$	16,355
Reallocation as a result of    conversion of Class B to    Class A common stock:
Net income attributable to    common stockholders, basic		7,960		—		7,782		—		15,459		—		16,355		—
Reallocation of net income to    Class B common stock		—		3,177		—		2,759		—		6,096		—		5,391
Net income attributable to    common stockholders, diluted	$	50,286	$	11,137	$	38,602	$	10,541	$	94,596	$	21,555	$	75,598	$	21,746
Denominator
Number of shares used for basic    EPS computation		120,994		22,754		111,786		28,224		119,857		23,414		109,204		30,147
Conversion of Class B to Class A    common stock		22,754		—		28,224		—		23,414		—		30,147		—
Effect of potentially dilutive    common shares		11,668		11,668		13,768		13,768		11,956		11,956		13,950		13,950
Weighted average shares used in    computing net income per share    attributable to common    stockholders, diluted		155,416		34,422		153,778		41,992		155,227		35,370		153,301		44,097
Net income per share attributable    to common stockholders, diluted	$	0.32	$	0.32	$	0.25	$	0.25	$	0.61	$	0.61	$	0.49	$	0.49

* See note 1 of the notes to the condensed consolidated financial statements for a summary of adjustments.

Potential Common Share Equivalents Excluded where the Inclusion would be Anti-dilutive

Potential common share equivalents excluded where the inclusion would be anti-dilutive are as follows:

	Three Months Ended July 31,				Six Months Ended July 31,
	2018		2017		2018		2017
Options and awards to purchase shares not included in the    computation of diluted net income per share because    their inclusion would be anti-dilutive		3,157,436		337,503		3,123,695		558,126