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CONVERTIBLE SENIOR NOTES AND CAPPED CALL - Narrative (Details)
$ / shares in Units, shares in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2019
USD ($)
Feb. 28, 2019
USD ($)
day
$ / shares
shares
Mar. 31, 2021
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
$ / shares
Dec. 01, 2019
USD ($)
Debt Instrument [Line Items]          
Common stock, par value per share (in dollars per share) | $ / shares     $ 0.001 $ 0.001  
Debt issuance costs, net   $ 600,000      
Convertible Debt | Convertible Senior Notes          
Debt Instrument [Line Items]          
Debt instrument, face value   $ 287,500,000 $ 362,500,000 $ 362,500,000  
Debt instrument, interest rate   0.50%      
Proceeds from issuance of debt   $ 245,800,000      
Debt instrument, convertible, conversion ratio   0.0389484      
Common stock, par value per share (in dollars per share) | $ / shares   $ 0.001      
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares   $ 25.68      
Debt instrument, convertible, threshold trading days | day   20      
Debt instrument, convertible, threshold consecutive trading days | day   30      
Debt instrument, convertible, threshold percentage of stock price trigger   130.00%      
Debt instrument, convertible, measurement period | day   5      
Debt instrument, convertible, threshold consecutive trading days preceding measurement period | day   10      
Debt instrument, threshold percentage of sales price per share   98.00%      
Debt instrument, redemption price, percentage   100.00%      
Unamortized debt discount and issuance costs     34 months    
Debt instrument, strike price per share (in dollars per share) | $ / shares   $ 25.68      
Debt instrument, initial cap price per share (in dollars per share) | $ / shares   $ 39.50      
Convertible Debt | Additional Notes          
Debt Instrument [Line Items]          
Debt instrument, face value $ 75,000,000        
Debt instrument, interest rate 0.50%        
Proceeds from issuance of debt $ 64,600,000        
Conversion option   $ 12,400,000      
Debt instrument, effective interest rate   5.30%      
Payments for capped call transactions   $ 9,300,000 $ 9,288,000    
Convertible Debt | Aggregate Notes          
Debt Instrument [Line Items]          
Debt instrument, face value         $ 362,500,000
Debt instrument, redemption price, percentage   100.00%      
Convertible Debt | Initial Notes          
Debt Instrument [Line Items]          
Conversion option   $ 64,900,000      
Debt instrument, effective interest rate   6.50%      
Payments for capped call transactions   $ 33,700,000 $ 33,724,000    
Call Option | Convertible Debt | Convertible Senior Notes          
Debt Instrument [Line Items]          
Option indexed to issuer's equity, indexed shares (in shares) | shares   14.1