Funds Held for Customers - Summary of Fair Value of Funds Held For Customers (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Jun. 30, 2020
Funds Held For Customers [Line Items]
Amortized cost	$ 771,220	$ 626,740
Gross unrealized gains	142	2,055
Gross unrealized losses	(99)	(11)
Fair value	771,263	628,784
Corporate Bonds
Funds Held For Customers [Line Items]
Amortized cost	489,164	491,950
Gross unrealized gains	78	1,936
Gross unrealized losses	(84)	(7)
Fair value	489,158	493,879
U.S. Treasury Securities
Funds Held For Customers [Line Items]
Amortized cost	9,996	48,949
Gross unrealized gains	4	4
Gross unrealized losses		(1)
Fair value	10,000	48,952
Asset Backed Securities
Funds Held For Customers [Line Items]
Amortized cost	15,001
Gross unrealized gains	0
Gross unrealized losses	(7)
Fair value	14,994
Certificates of Deposit
Funds Held For Customers [Line Items]
Amortized cost	222,128	85,841
Gross unrealized gains	57	115
Gross unrealized losses	(4)	(3)
Fair value	222,181	$ 85,953
Municipal Bonds
Funds Held For Customers [Line Items]
Amortized cost	34,931
Gross unrealized gains	3
Gross unrealized losses	(4)
Fair value	$ 34,930