CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2026	Sep. 30, 2025
Current assets
Cash and cash equivalents	$ 2,647	$ 66,672
Accounts receivable, net	48,519	58,467
Settlement assets	36	411
Prepaid expenses and other current assets	12,270	12,075
Total current assets	63,472	137,625
Property and equipment, net	6,627	7,181
Restricted cash	2,760	250
Goodwill	282,284	248,469
Deferred tax asset	46,595	49,058
Operating lease right-of-use assets	4,495	4,577
Other assets	16,169	7,140
Total assets	626,984	638,411
Current liabilities
Accounts payable	4,384	6,248
Accrued expenses and other current liabilities	21,026	24,525
Settlement obligations	36	411
Deferred revenue	25,285	37,678
Current portion of operating lease liabilities	1,907	1,827
Total current liabilities	52,638	70,689
Long-term debt, less current portion	114,276	0
Long-term tax receivable agreement obligations	32,192	32,191
Operating lease liabilities, less current portion	2,689	2,964
Other long-term liabilities	24,859	14,844
Total liabilities	226,654	120,688
Commitments and contingencies (see Note 11)
Stockholders' equity
Preferred stock, par value $0.0001 per share, 10,000,000 shares authorized; 0 shares issued and outstanding as of both June 30, 2026 and September 30, 2025	0	0
Additional paid-in capital	156,844	271,310
Accumulated earnings	123,700	118,270
Total stockholders' equity	280,547	389,583
Non-controlling interest	119,783	128,140
Total equity	400,330	517,723
Total liabilities and equity	626,984	638,411
Capitalized software, net
Current assets
Intangible assets, net	50,983	48,314
Intangible assets, net
Current assets
Intangible assets, net	153,599	135,797
Class A Common Stock
Stockholders' equity
Common stock	$ 2	$ 2
Common Stock issued (in shares)	18,241,855	23,983,125
Common Stock, outstanding (in shares)	18,241,855	23,983,125
Class B Common Stock
Stockholders' equity
Common stock	$ 1	$ 1
Common Stock issued (in shares)	8,381,681	8,381,681
Common Stock, outstanding (in shares)	8,381,681	8,381,681

Tax Receivable Agreement Obligation, Noncurrent

No definition available.

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Namespace Prefix:	iiiv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).