Funds Held for Customers - Summary of Fair Value of Funds Held For Customers (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Funds Held For Customers [Line Items]
Amortized cost	$ 626,740	$ 437,979
Gross unrealized gains	2,055	441
Gross unrealized losses	(11)	(13)
Fair value	628,784	438,407
Certificates of Deposit
Funds Held For Customers [Line Items]
Amortized cost	85,841	105,297
Gross unrealized gains	115	81
Gross unrealized losses	(3)	(1)
Fair value	85,953	105,377
Corporate Bonds
Funds Held For Customers [Line Items]
Amortized cost	491,950	301,755
Gross unrealized gains	1,936	327
Gross unrealized losses	(7)	(12)
Fair value	493,879	302,070
U.S. Treasury Securities
Funds Held For Customers [Line Items]
Amortized cost	48,949	30,927
Gross unrealized gains	4	33
Gross unrealized losses	(1)
Fair value	$ 48,952	$ 30,960