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Net Loss Per Share (Tables)
 3 Months Ended
Apr. 30, 2018
Earnings Per Share [Abstract]  
Summary of Calculation of Basic and Diluted Net Loss Per Share
The following table presents the calculation of basic and diluted net loss attributable to common stockholders per share (in thousands, except per share data):
 
Three Months Ended April 30,
 
2018
 
2017
 
Class A
 
Class B
 
Class A
 
Class B
Net loss per share, basic and diluted:
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
Allocation of distributed net loss
$
(50,145
)
 
$
(24,265
)
 
$
(40,599
)
 
$
(23,445
)
Denominator:
 
 
 
 
 
 
 
Weighted-average common shares outstanding
143,579

 
69,476

 
129,206

 
74,612

Basic and diluted net loss per share
$
(0.35
)
 
$
(0.35
)
 
$
(0.31
)
 
$
(0.31
)
Shares Excluded from Diluted Loss Per Share
The anti-dilutive securities excluded from the weighted-average shares used to calculate the diluted net loss per common share were as follows (in thousands):
 
As of April 30,
 
2018
 
2017
Outstanding common stock options
6,079

 
8,468

Shares subject to repurchase
—

 
70

Unvested restricted stock awards, units, and PRSUs
15,051

 
15,133

Shares related to the convertible senior notes
15,079

 
7,261

Shares subject to warrants related to the issuance of convertible senior notes
15,079

 
7,261

Shares issuable pursuant to the ESPP
466

 
485

 
51,754

 
38,678