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Convertible Notes - Additional Information (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended
Oct. 07, 2014
USD ($)
$ / shares
Oct. 01, 2014
USD ($)
$ / shares
shares
Aug. 31, 2019
USD ($)
May 31, 2019
USD ($)
$ / shares
shares
Feb. 28, 2019
USD ($)
May 31, 2018
$ / shares
Debt Instrument [Line Items]            
Closing price of common stock (in dollars per share) | $ / shares       $ 184.30    
If-converted value in excess of principal       $ 287,600    
Convertible notes, current       $ 188,553 $ 69,827  
Strike price of warrants (in dollars per share) | $ / shares   $ 101.65   $ 101.65   $ 101.65
Purchase of convertible note hedges   $ 148,000        
Proceeds from issuance of warrants   $ 79,800        
Number of shares of common stock underlying the warrants | shares   10,965,630        
Fundamental Change            
Debt Instrument [Line Items]            
Repurchase of note principal amount 100.00%          
Default            
Debt Instrument [Line Items]            
Repurchase of note principal amount 100.00%          
Ownership percentage of outstanding principal amount 25.00%          
0.25% Convertible Senior Notes due 2019            
Debt Instrument [Line Items]            
Debt instrument, face amount $ 805,000          
Debt instrument, interest rate       0.25%   0.25%
Converted instrument, amount       $ 116,200    
Converted instrument, shares issued (in shares) | shares       943,513    
Loss on settled conversions       $ 200    
Debt Conversion, Converted Instrument, Total Amount       $ 614,600    
Options exercised under convertible note hedge transaction (in shares) | shares       954,731    
0.25% Convertible Senior Notes due 2019 | Unsecured Debt            
Debt Instrument [Line Items]            
Debt instrument, offering date Oct. 01, 2014          
Debt instrument, interest rate 0.25%          
Frequency of interest payment semiannually in arrears on April 1 and October 1 of each year, beginning on April 1, 2015.          
Debt instrument, maturity date Oct. 01, 2019          
Common stock conversion rate 0.0136219          
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares $ 73.41 $ 73.41        
Subsequent Event | 0.25% Convertible Senior Notes due 2019            
Debt Instrument [Line Items]            
Converted instrument, amount     $ 3,000