XML 62 R50.htm IDEA: XBRL DOCUMENT v3.21.2
Notes Payable, Net - Additional Information (Detail)
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2021
USD ($)
May 31, 2021
USD ($)
$ / shares
May 31, 2021
USD ($)
$ / shares
Aug. 31, 2020
USD ($)
May 31, 2020
Debt Instrument [Line Items]          
Loss on extinguishment of debt $ 4,800,000 $ 4,763,000 $ 4,763,000    
2.875% Convertible senior notes, due 2028          
Debt Instrument [Line Items]          
Proceeds from convertible senior notes 373,800,000   $ 373,800,000    
Debt instrument, interest rate   2.875% 2.875%    
Principal amount outstanding   $ 373,750,000 $ 373,750,000    
Description of long term debt     The notes bear interest at an annual rate of 2.875% payable semiannually in arrears on April 15 and October 15 of each year, commencing October 15, 2021.    
Frequency of payments     semiannually    
Debt instrument, maturity date     Apr. 15, 2028    
Convertible notes initial conversion rate, shares per $1,000 principal amount     0.180317    
Debt instrument, convertible, principal amount     $ 1,000    
Convertible notes conversion rate, per share | $ / shares   $ 55.46 $ 55.46    
Convertible senior notes, due 2028 - equity component, net of tax     $ 73,600,000    
Debt instrument amortized to interest expense, effective interest rate     5.75%    
Convertible notes, liability and equity component     $ 12,000,000.0    
2.875% Convertible senior notes, due 2028 | Redemption on or After April 15, 2025          
Debt Instrument [Line Items]          
Debt instrument, convertible, latest date     Jan. 15, 2028    
Debt instrument redemption start date     Apr. 15, 2025    
Debt instrument redemption end date     Apr. 15, 2028    
Debt instrument, convertible, threshold percentage of stock price trigger     130.00%    
Debt instrument redemption description     Additionally, the Company may elect to call the notes on or after April 15, 2025 and on or before the 40th trading day prior to April 15, 2028, at a cash redemption price described in the 2028 Notes Indenture if the stock price exceeds 130% of the conversion price during certain trading days as defined in the 2028 Notes Indenture.    
2.875% and 2.25% Convertible senior notes, due 2024          
Debt Instrument [Line Items]          
Net proceeds used to repurchase convertible notes 283,300,000        
Principal amount of debt repurchased $ 207,100,000        
2.875% Convertible senior notes, due 2024          
Debt Instrument [Line Items]          
Debt instrument, interest rate 2.875% 2.875% 2.875%   2.875%
Fair value of the liability component $ 198,100,000        
Principal amount outstanding $ 67,900,000 $ 67,876,000 $ 67,876,000 $ 275,000,000  
2.25% Convertible senior notes, due 2024          
Debt Instrument [Line Items]          
Debt instrument, interest rate 2.25% 2.25% 2.25%   2.25%
Fair value of the liability component $ 46,500,000        
Principal amount outstanding       $ 50,000,000