CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Cash flows from operating activities:
Net income (loss)	$ 22,302	$ (3,414)
Adjustments to reconcile net income (loss) from operating activities:
Depreciation and amortization	22,788	29,865
Equity-based compensation	15,142	17,387
Amortization of debt issuance costs	746	897
Gain on repurchase of exchangeable notes	0	(2,397)
Loss on sale of exchangeable senior note hedges	0	245
Gain on repurchases of warrants	0	(105)
Provision for deferred income taxes	3,644	4,078
Non-cash lease expense	1,933	3,534
Changes in non-cash contingent consideration expense from original estimate	1,743	(545)
Other non-cash adjustments to net income	36	793
Changes in operating assets:
Accounts receivable	1,955	7,574
Prepaid expenses and other current assets	(922)	(1,398)
Other assets	(1,023)	(1,076)
Changes in operating liabilities:
Accounts payable	(677)	(415)
Accrued expenses and other current liabilities	(37,450)	(6,718)
Acquisition escrow obligations	(2,174)	(1,820)
Deferred revenue	(7,597)	(3,141)
Operating lease liabilities	(2,561)	(3,510)
Other long-term liabilities	(102)	(2)
Contingent consideration paid in excess of original estimates	(760)	(6,566)
Net cash (used in) provided by operating activities	(8,276)	33,266
Cash flows from investing activities:
Expenditures for property and equipment	(1,516)	(2,434)
Proceeds from sale of property and equipment	1,501	618
Expenditures for capitalized software	(6,301)	(9,223)
Purchases of merchant portfolios and residual buyouts	(12)	(4,585)
Acquisitions of businesses, net of cash and restricted cash acquired	(11,000)	(1,100)
Proceeds from sale of Healthcare RCM Business, net of cash sold	96,102	0
Payments for other investing activities	0	(39)
Proceeds from other investing activities	0	8
Net cash provided by (used in) investing activities	78,774	(16,755)
Cash flows from financing activities:
Proceeds from revolving credit facility	58,024	296,043
Payments on revolving credit facility	(58,024)	(217,149)
Payments to extinguish exchangeable notes	(26,223)	0
Payments for repurchase of exchangeable notes	0	(87,840)
Proceeds from sale of exchangeable senior note hedges	0	1,238
Payments for repurchases of warrants	0	(552)
Payments of debt issuance costs	(249)	(906)
Payments for repurchases of Class A common stock	(37,604)	0
Net payments for settlement obligations	(614)	(3,518)
Cash paid for contingent consideration	(800)	(760)
Payments for required distributions to members or on behalf of members for tax obligations	(24,849)	(1,117)
Payments for required distributions to members under the Tax Receivable Agreement	(9,954)	0
Proceeds from stock option exercises	150	25
Payments for employees' tax withholdings from net settled stock option exercises and RSU releases	(4,140)	(679)
Net cash used in financing activities	(104,283)	(15,215)
Net (decrease) increase in cash, cash equivalents and restricted cash	(33,785)	1,296
Cash, cash equivalents and restricted cash at beginning of period	89,597	12,400
Cash, cash equivalents and restricted cash at end of period	55,812	13,696
Supplemental disclosure of cash flow information:
Cash paid for interest	763	21,773
Cash paid for income taxes	35,112	6,984
Merchant Services Business
Adjustments to reconcile net income (loss) from operating activities:
Gain (loss) on disposition of business	661
Healthcare RCM Business
Adjustments to reconcile net income (loss) from operating activities:
Gain (loss) on disposition of business	$ (25,960)	$ 0