Net Income per Share Attributable to Common Stockholders (Tables)

9 Months Ended

Oct. 31, 2013

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, 2013						Three Months Ended October 31, 2012					Nine Months Ended October 31, 2013						Nine Months Ended October 31, 2012
	Class A			Class B			Class A		Class B			Class A			Class B			Class A		Class B
Basic
Numerator
Net income	$	328		$	6,197		$	—	$	5,749		$	365		$	17,003		$	—	$	13,099
Noncumulative dividends on convertible preferred stock		(6	)		(119	)		—		(140	)		(8	)		(396	)		—		(420	)
Undistributed earnings allocated to participating securities		(204	)		(3,857	)		—		(4,547	)		(260	)		(12,091	)		—		(10,348	)
Net income attributable to common stockholders, basic	$	118		$	2,221		$	—	$	1,062		$	97		$	4,516		$	—	$	2,331
Denominator
Weighted-average shares used in computing net income per share attributable to common stockholders, basic		1,800			34,002			—		20,743			600			27,919			—		19,834
Net income per share attributable to common stockholders, basic	$	0.07		$	0.07		$	—	$	0.05		$	0.16		$	0.16		$	—	$	0.12
Diluted
Numerator
Net income attributable to common stockholders, basic	$	118		$	2,221		$	—	$	1,062		$	97		$	4,516		$	—	$	2,331
Add back of:
Noncumulative dividends on convertible preferred stock		6			119			—		—			8			396			—		—
Undistributed earnings allocated to participating securities		204			3,857			—		—			260			12,091			—		—
Reallocation as a result of conversion of Class B to Class A common stock:
Net income attributable to common stockholders, basic		2,221			—			—		—			4,516			—			—		—
Noncumulative dividends on convertible preferred stock		119			—			—		—			396			—			—		—
Undistributed earnings allocated to participating securities		3,857			—			—		—			12,091			—			—		—
Undistributed earnings allocated to participating securities		(138	)		(138	)		—		—			(431	)		(431	)		—		—
Net income attributable to common stockholders, diluted	$	6,387		$	6,059		$	—	$	1,062		$	16,937		$	16,572		$	—	$	2,331
Denominator
Number of shares used for basic EPS computation		1,800			34,002			—		20,743			600			27,919			—		19,834
Conversion of Class B to Class A common stock		34,002			—			—		—			27,919			—			—		—
Effect of potentially dilutive securities		19,639			19,639			—		9,626			18,939			18,939			—		9,326
Effect of conversion of preferred stock upon IPO		76,522			76,522			—		—			82,143			82,143			—		—
Weighted average shares used in computing net income per share attributable to common stockholders, diluted		131,963			130,163			—		30,369			129,601			129,001			—		29,160
Net income per share attributable to common stockholders, diluted	$	0.05		$	0.05		$	—	$	0.03		$	0.13		$	0.13		$	—	$	0.08