Acquired Card Receivables - Summary of Change in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Allowance For Credit Losses [Roll Forward]
Balance, beginning	$ 15,498	$ 5,414
Initial allowance for expected credit losses on purchased card receivables with credit deterioration	0	10
Provision for expected credit losses	52,327	32,015
Charge-off amounts	(51,805)	(24,120)
Recoveries collected	4,863	2,179
Balance, ending	$ 20,883	$ 15,498