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Fair Value Measurement (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Fair value measurements    
Funds held for clients' cash and cash equivalents $ 1,102,538  
Available-for-sale securities:    
Available for sale debt securities 123,808  
Total investments at fair value 1,226,346 $ 942,459
Fair value asset transfers    
Transfers from level 1 to level 2 0  
Transfers from level 2 to level 1 0  
Level 1    
Fair value measurements    
Funds held for clients' cash and cash equivalents 1,076,414  
Available-for-sale securities:    
Total investments at fair value 1,076,414  
Level 2    
Fair value measurements    
Funds held for clients' cash and cash equivalents 26,124  
Available-for-sale securities:    
Available for sale debt securities 123,808  
Total investments at fair value 149,932  
Level 3    
Available-for-sale securities:    
Available for sale debt securities 0  
Commercial paper    
Available-for-sale securities:    
Available for sale debt securities 50,702  
Commercial paper | Level 2    
Available-for-sale securities:    
Available for sale debt securities 50,702  
Corporate bonds    
Available-for-sale securities:    
Available for sale debt securities 37,382  
Corporate bonds | Level 2    
Available-for-sale securities:    
Available for sale debt securities 37,382  
Asset-backed securities    
Available-for-sale securities:    
Available for sale debt securities 25,847  
Asset-backed securities | Level 2    
Available-for-sale securities:    
Available for sale debt securities 25,847  
U.S. treasury securities    
Available-for-sale securities:    
Available for sale debt securities 9,877  
U.S. treasury securities | Level 2    
Available-for-sale securities:    
Available for sale debt securities $ 9,877