Interest Income and Interest Expense - Schedule of Interest Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
Interest income:
Investment securities	$ 6,180	$ 3,845	$ 15,835	$ 12,078
Interest income	353,292	285,206	984,464	851,626
Interest expense:
Short-term borrowings	50,639	3,802	116,034	10,271
Total interest expense	281,709	173,654	736,621	522,027
Net interest income	71,583	111,552	247,843	329,599
Loans receivable
Interest income:
Loans	347,112	281,361	968,629	839,548
Long-term debt
Interest expense:
Long-term debt and subordinated debt	204,876	143,639	541,678	432,608
Subordinated debt
Interest expense:
Long-term debt and subordinated debt	$ 26,194	$ 26,213	$ 78,909	$ 79,148