Funds Held for Customers - Summary of Gross Unrealized Losses And Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jun. 30, 2019
Funds Held For Customers [Line Items]
Fair value	$ 122,682	$ 58,092
Unrealized losses	(30)	(13)
Certificates of Deposit
Funds Held For Customers [Line Items]
Fair value	13,025	12,027
Unrealized losses	(2)	(1)
Corporate Bonds
Funds Held For Customers [Line Items]
Fair value	94,472	46,065
Unrealized losses	(27)	$ (12)
U.S. Treasury Securities
Funds Held For Customers [Line Items]
Fair value	15,185
Unrealized losses	$ (1)