Funds Held for Customers - Summary of Fair Value of Funds Held For Customers (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Funds Held For Customers [Line Items]
Amortized cost	$ 914,334	$ 626,740
Gross unrealized gains	33	2,055
Gross unrealized losses	(39)	(11)
Fair value	914,328	628,784
Corporate Bonds
Funds Held For Customers [Line Items]
Amortized cost	516,364	491,950
Gross unrealized gains	24	1,936
Gross unrealized losses	(38)	(7)
Fair value	516,350	493,879
Asset Backed Securities
Funds Held For Customers [Line Items]
Amortized cost	25,081
Gross unrealized gains	4
Fair value	25,085
U.S. Treasury Securities
Funds Held For Customers [Line Items]
Amortized cost	3,010	48,949
Gross unrealized gains		4
Gross unrealized losses	(1)	(1)
Fair value	3,009	48,952
Certificates of Deposit
Funds Held For Customers [Line Items]
Amortized cost	326,927	85,841
Gross unrealized gains		115
Gross unrealized losses		(3)
Fair value	326,927	$ 85,953
Municipal Bonds
Funds Held For Customers [Line Items]
Amortized cost	42,952
Gross unrealized gains	5
Fair value	$ 42,957