Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=116637345&loc=SL114874292-224272

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

Name:	us-gaap_RevenueFromRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jun. 25, 2018
Related Party Transaction [Line Items]
Percent of tax benefits payable to continuing equity owners			85.00%
Continuing Equity Owner \| Class B Common Stock
Related Party Transaction [Line Items]
Tax benefits due to Continuing Equity Owners	$ 23,229
Axia Tech \| Affiliated Entity
Related Party Transaction [Line Items]
Net revenue from related party	$ 22	$ 18
i3Verticals, LLC \| Affiliated Entity
Related Party Transaction [Line Items]
Ownership interest in Axia Tech (percent)	2.00%
Chief Executive Officer \| Affiliated Entity
Related Party Transaction [Line Items]
Ownership interest in Axia Tech (percent)	10.50%
Chief Financial Officer \| Affiliated Entity
Related Party Transaction [Line Items]
Ownership interest in Axia Tech (percent)	0.40%