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Fair Value Measurement (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Fair value measurement      
Cash and cash equivalents $ 218,696 $ 250,851 $ 75,900
Funds held for clients' cash and cash equivalents 2,154,552 1,241,282 $ 1,660,771
Total investments at fair value 2,436,619 1,615,310  
Available-for-sale securities:      
Total available-for-sale securities 63,371 123,177  
Level 1      
Fair value measurement      
Cash and cash equivalents 218,696 250,851  
Funds held for clients' cash and cash equivalents 2,154,552 1,241,282  
Total investments at fair value 2,373,248 1,492,133  
Level 2      
Fair value measurement      
Total investments at fair value 63,371 123,177  
Available-for-sale securities:      
Total available-for-sale securities 63,371 123,177  
Level 3      
Available-for-sale securities:      
Total available-for-sale securities 0 0  
Commercial paper      
Available-for-sale securities:      
Total available-for-sale securities   6,649  
Commercial paper | Level 2      
Available-for-sale securities:      
Total available-for-sale securities   6,649  
Corporate bonds      
Available-for-sale securities:      
Total available-for-sale securities 33,345 44,757  
Corporate bonds | Level 2      
Available-for-sale securities:      
Total available-for-sale securities 33,345 44,757  
Asset-backed securities      
Available-for-sale securities:      
Total available-for-sale securities 30,026 50,402  
Asset-backed securities | Level 2      
Available-for-sale securities:      
Total available-for-sale securities $ 30,026 50,402  
U.S. treasury securities      
Available-for-sale securities:      
Total available-for-sale securities   21,369  
U.S. treasury securities | Level 2      
Available-for-sale securities:      
Total available-for-sale securities   $ 21,369