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Convertible Senior Notes (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2018
USD ($)
day
$ / shares
shares
Jan. 31, 2019
USD ($)
$ / shares
Oct. 31, 2018
$ / shares
Apr. 04, 2018
$ / shares
Debt Instrument [Line Items]        
Convertible Debt  
The Notes consisted of the following (in thousands):
 
As of January 31, 2019
Liability:
 
Principal
$
575,000

Less: debt discount, net of amortization
(116,722
)
Less: debt issuance costs, net of amortization
(8,450
)
Net carrying amount of the Notes
$
449,828

 
 
Stockholders' equity:
 
Allocated value of the conversion feature
$
136,333

Less: debt issuance costs
(3,068
)
Additional paid-in capital
$
133,265

   
Debt issuance costs, net of amortization $ 12,900      
Closing price of stock (in dollars per share) | $ / shares   $ 17.91    
Capped Call        
Debt Instrument [Line Items]        
Payment to enter into agreement 64,600      
Convertible Senior Notes        
Debt Instrument [Line Items]        
Principal   $ 575,000    
Debt issuance costs, net of amortization 9,800 8,450    
Additional Paid-In Capital        
Debt Instrument [Line Items]        
Debt issuance costs, net of amortization $ 3,100 3,068    
Class A common stock        
Debt Instrument [Line Items]        
Closing price of stock (in dollars per share) | $ / shares     $ 17.91 $ 19.83
Class A common stock | Capped Call        
Debt Instrument [Line Items]        
Exercise price (in dollars per share) | $ / shares $ 39.66      
Exercise price premium percentage over last reported sales price       100.00%
Convertible Senior Notes        
Debt Instrument [Line Items]        
Interest rate ( as a percent) 0.125%      
Proceeds from issuance of convertible senior notes, net of issuance costs $ 562,100      
Conversion percentage of principal amount plus accrued and unpaid contingent interest 100.00%      
Convertible debt, fair value based on the closing trading price per $100 of the Notes   558,200    
If-converted value   $ 391,900    
Convertible Senior Notes | Class A common stock        
Debt Instrument [Line Items]        
Converted Instrument (in shares) | shares 21,884,155      
Conversion ratio (in shares per $1,000 principal amount) 38.0594      
Conversion price (in dollars per share) | $ / shares $ 26.27      
Redemption percentage of principal amount of Notes to be redeemed 100.00%      
Convertible Senior Notes | Class A common stock | Any Fiscal Quarter Commencing After the Fiscal Quarter Ending on July 31, 2018        
Debt Instrument [Line Items]        
Threshold trading days | day 20      
Threshold consecutive trading days | day 30      
Threshold percentage of stock price trigger 130.00%      
Convertible Senior Notes | Class A common stock | Five Business Day Period After any Five Consecutive Trading Day Period        
Debt Instrument [Line Items]        
Threshold consecutive trading days | day 5      
Threshold percentage of stock price trigger 98.00%      
Threshold business days | day 5      
Convertible Senior Notes | Class A common stock | Immediately Preceding the Date on Which We Provide Notice of Redemption        
Debt Instrument [Line Items]        
Threshold trading days | day 2