Net Income per Share Attributable to Common Stockholders (Tables)

9 Months Ended

Oct. 31, 2016

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 October 31,										Nine Months Ended October 31,
	2016				2015						2016						2015
	Class A		Class B		Class A			Class B			Class A			Class B			Class A			Class B
Basic
Numerator
Net income	$	16,190	$	5,440	$	6,156		$	4,326		$	33,637		$	13,460		$	20,545		$	16,325
Undistributed earnings allocated to    participating securities		—		—		(5	)		(4	)		(1	)		(1	)		(21	)		(17	)
Net income attributable to common    stockholders, basic	$	16,190	$	5,440	$	6,151		$	4,322		$	33,636		$	13,459		$	20,524		$	16,308
Denominator
Weighted average shares used in    computing net income per    share attributable to common    stockholders, basic		101,514		34,110		77,759			54,654			96,521			38,623			73,405			58,326
Net income per share attributable to common    stockholders, basic	$	0.16	$	0.16	$	0.08		$	0.08		$	0.35		$	0.35		$	0.28		$	0.28
Diluted
Numerator
Net income attributable to common    stockholders, basic	$	16,190	$	5,440	$	6,151		$	4,322		$	33,636		$	13,459		$	20,524		$	16,308
Reallocation as a result of conversion of    Class B to Class A    common stock:
Net income attributable to common    stockholders, basic		5,440		—		4,322			—			13,459			—			16,308			—
Reallocation of net income to Class B    common stock		—		1,297		—			537			—			2,728			—			1,867
Net income attributable to common    stockholders, diluted	$	21,630	$	6,737	$	10,473		$	4,859		$	47,095		$	16,187		$	36,832		$	18,175
Denominator
Number of shares used for basic EPS    computation		101,514		34,110		77,759			54,654			96,521			38,623			73,405			58,326
Conversion of Class B to Class A common    stock		34,110		—		54,654			—			38,623			—			58,326			—
Effect of potentially dilutive common    shares		11,812		11,812		12,650			12,650			11,929			11,929			13,178			13,178
Weighted average shares used in    computing net income per    share attributable to common    stockholders, diluted		147,436		45,922		145,063			67,304			147,073			50,552			144,909			71,504
Net income per share attributable to    common stockholders, diluted	$	0.15	$	0.15	$	0.07		$	0.07		$	0.32		$	0.32		$	0.25		$	0.25

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 October 31,				Nine Months Ended October 31,
	2016		2015		2016		2015
Options and awards to purchase shares not included in the    computation of diluted net income per share because their    inclusion would be anti-dilutive		371,096		1,381,629		1,983,974		891,148