Acquired Card Receivables - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Jun. 30, 2022
Financing Receivable, Past Due [Line Items]
Acquired card receivable as collateral	$ 194,100,000		$ 194,100,000
Authorized transactions but not cleared	64,300,000		$ 64,300,000
Grace period to payment on acquired card receivables			5 days
Card receivables acquired during the period	3,400,000,000	$ 1,700,000,000	$ 9,400,000,000	$ 4,400,000,000
Gross charge-off amount, prior fiscal year			10,100,000
Gross charge-off amount, current fiscal year			6,500,000
Transferred card receivables	0		0		$ 57,300,000
Fair value, beneficial interest derivative	0		0		0
Servicing fee income	0	$ 0	0	$ 0
Prepaid Expenses and Other Current Assets
Financing Receivable, Past Due [Line Items]
Card receivables held for sale, amount	$ 0		$ 0		$ 8,700,000