Funds Held for Customers - Summary of Fair Value of Funds Held For Customers (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jun. 30, 2019
Funds Held For Customers [Line Items]
Amortized cost	$ 428,814	$ 437,979
Gross unrealized gains	191	441
Gross unrealized losses	(30)	(13)
Fair value	428,975	438,407
Certificates of Deposit
Funds Held For Customers [Line Items]
Amortized cost	105,977	105,297
Gross unrealized gains	36	81
Gross unrealized losses	(2)	(1)
Fair value	106,011	105,377
Corporate Bonds
Funds Held For Customers [Line Items]
Amortized cost	303,652	301,755
Gross unrealized gains	148	327
Gross unrealized losses	(27)	(12)
Fair value	303,773	302,070
U.S. Treasury Securities
Funds Held For Customers [Line Items]
Amortized cost	19,185	30,927
Gross unrealized gains	7	33
Gross unrealized losses	(1)
Fair value	$ 19,191	$ 30,960