Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net income before noncontrolling interest	$ 169,650,000	$ 165,807,000	$ 159,354,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	57,765,000	64,955,000	61,601,000
Provision for credit loss	42,661,000	57,354,000	28,538,000
Provision for deferred taxes	11,115,000	(175,000)	17,587,000
Originations of loans held for sale	(2,034,977,000)	(1,208,684,000)	(985,330,000)
Proceeds from sales of loans held for sale	2,036,084,000	1,139,881,000	1,059,361,000
Net change in loans held for sale	18,127,000	25,922,000	12,819,000
Fair value adjustment of foreclosed real estate	0	0	301,000
Net realized (gain) on securities available for sale	0	0	(154,000)
Net realized (gain) loss on loans held for sale	(5,920,000)	(268,000)	3,694,000
Net realized loss on premise, furniture, and equipment	0	65,000	55,000
Net realized (gain) on trademarks	0	(10,000,000)	(50,000,000)
Net realized (gain) on other	(6,749,000)	(1,832,000)	(1,956,000)
Change in bank-owned life insurance value	(2,751,000)	(1,497,000)	(2,434,000)
Impairment on rental equipment	2,013,000	24,000	0
Impairment of intangibles	0	0	670,000
Net change in accrued interest receivable	(8,103,000)	(5,303,000)	(1,725,000)
Net change in other assets	(11,747,000)	17,134,000	(32,936,000)
Net change in accrued expenses and other liabilities	176,083,000	48,658,000	(10,640,000)
Stock compensation	10,286,000	11,070,000	10,004,000
Net cash provided by operating activities	453,537,000	303,111,000	268,809,000
Cash flows from investing activities:
Purchases of securities available for sale	(3,465,000)	(156,885,000)	(907,361,000)
Proceeds from sales of securities available for sale	0	0	265,951,000
Proceeds from maturities of and principal collected on securities available for sale	201,730,000	177,296,000	324,234,000
Proceeds from maturities of and principal collected on securities held to maturity	3,317,000	4,835,000	14,281,000
Purchases of Federal Reserve Bank and Federal Home Loan Bank stock	(406,390,000)	(330,144,000)	(173,653,000)
Redemption of Federal Reserve Bank and Federal Home Loan Bank stock	398,587,000	330,746,000	173,240,000
Purchases of loans and leases	(298,262,000)	(215,266,000)	(115,353,000)
Proceeds from sales of loans and leases	0	0	123,241,000
Net change in loans and leases	137,540,000	(307,473,000)	358,635,000
Purchases of premises, furniture, and equipment	(10,141,000)	(8,623,000)	(8,177,000)
Proceeds from sales of premises, furniture, and equipment	0	0	35,000
Purchases of rental equipment	(266,613,000)	(441,047,000)	(424,919,000)
Proceeds from sales of rental equipment	9,006,000	14,998,000	9,372,000
Net change in rental equipment	565,000	(236,000)	(5,772,000)
Proceeds from sales of foreclosed real estate and repossessed assets	0	1,000	1,824,000
Proceeds from death benefit of bank-owned life insurance	0	1,040,000	0
Proceeds from sale of trademarks	0	10,000,000	50,000,000
Proceeds from sale of other assets	6,465,000	0	3,550,000
Net cash (used in) investing activities	(227,661,000)	(920,758,000)	(310,872,000)
Cash flows from financing activities:
Net change in deposits	(714,097,000)	723,145,000	351,066,000
Net change in short-term borrowings	364,000,000	13,000,000	0
Redemption of long-term borrowings	0	0	(75,000,000)
Proceeds from long-term borrowings	0	0	20,000,000
Principal payments on capital lease obligations	0	0	(75,000)
Principal payments on other liabilities	(621,000)	(1,747,000)	(2,751,000)
Payment of debt issuance costs	0	(511,000)	0
Dividends paid on common stock	(5,067,000)	(5,426,000)	(5,921,000)
Issuance of common stock due to restricted stock	3,000	1,000	1,000
Issuance of common stock due to ESOP	0	0	2,886,000
Repurchases of common stock	(86,853,000)	(120,437,000)	(168,235,000)
Investment by (distributions to) noncontrolling interest	(565,000)	(3,167,000)	(4,153,000)
Net cash provided by (used in) financing activities	(443,200,000)	604,858,000	117,818,000
Effect of exchange rate changes on cash	81,000	331,000	(1,736,000)
Net change in cash and cash equivalents	(217,243,000)	(12,458,000)	74,019,000
Cash and cash equivalents at beginning of fiscal year	375,580,000	388,038,000	314,019,000
Cash and cash equivalents at end of fiscal period	158,337,000	375,580,000	388,038,000
Supplemental disclosure of cash flow information:
Interest	20,909,000	10,819,000	5,259,000
Income taxes	19,633,000	14,056,000	13,940,000
Franchise and other taxes	726,000	1,359,000	791,000
Supplemental schedule of non-cash investing activities:
Held for sale to loans and leases	30,864,000	158,000	115,934,000
Loans and leases to held for sale	594,359,000	13,421,000	169,045,000
Loans and leases to rental equipment	4,847,000	3,122,000	3,893,000
Loans and leases to foreclosed real estate and repossessed assets	0	0	49,000
Rental equipment to loan and leases	225,870,000	377,250,000	400,148,000
Recognition of operating lease ROU assets, net of measurements	654,000	0	117,000
Retirement of treasury stock	$ 6,181,000	$ 6,943,000	$ 0