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Equity - Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Number of Shares    
Beginning balance (in shares) | shares 36,576  
Options granted (in shares) | shares 1,966  
Options exercised (in shares) | shares (5,446)  
Options forfeited or expired (in shares) | shares (333)  
Ending balance (in shares) | shares 32,763 36,576
Vested and exercisable, at end of period (in shares) | shares 10,232  
Vested and expected to vest, at end of period (in shares) | shares 29,765  
Weighted- Average Exercise Price    
Beginning balance (in dollars per share) | $ / shares $ 2.80  
Granted (in dollars per share) | $ / shares 12.56  
Exercised (in dollars per share) | $ / shares 0.93  
Forfeited or expired (in dollars per share) | $ / shares 3.24  
Ending balance (in dollars per share) | $ / shares 3.69 $ 2.80
Weighted average exercise price, vested and exercisable at period end (in dollars per share) | $ / shares 1.18  
Weighted average exercise price, vested and expected to vest at period end (in dollars per share) | $ / shares $ 3.55  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Average remaining contractual term, outstanding 7 years 9 months 18 days 7 years 10 months 9 days
Average remaining contractual term, vested and exercisable at period end 5 years 10 months 2 days  
Average remaining contractual term, vested and expected to vest at period end 7 years 8 months 1 day  
Aggregate intrinsic value, outstanding | $ $ 2,523,152 $ 357,366
Aggregate intrinsic value, vested and exercisable at period end | $ 813,709  
Aggregate intrinsic value, vested and expected to vest at period end | $ $ 2,296,324