Organization and Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	Jun. 10, 2019	Jun. 25, 2018	Mar. 31, 2020
IPO
Subsidiary, Sale of Stock [Line Items]
Shares issued (shares)		7,647,500
Public offering price (in USD per share)		$ 13.00
Net proceeds from IPO		$ 92,500
i3Verticals, LLC
Subsidiary, Sale of Stock [Line Items]
Non-controlling interest, ownership interest (percent)			54.80%
i3Verticals, LLC
Subsidiary, Sale of Stock [Line Items]
Net proceeds from IPO	$ 20,870
Common units, purchased (in units)	1,000,000
Continuing Equity Owner
Subsidiary, Sale of Stock [Line Items]
Common units, purchased (in units)	4,165,527
Class A Common and Class B Common Stock | Continuing Equity Owner
Subsidiary, Sale of Stock [Line Items]
Shareholders ownership interest (percent)			46.00%
Class B Common Stock | Continuing Equity Owner
Subsidiary, Sale of Stock [Line Items]
Shareholders ownership interest (percent)			45.20%
Class A Common Stock
Subsidiary, Sale of Stock [Line Items]
Shares issued (shares)	5,165,527
Public offering price (in USD per share)	$ 22.75
Net proceeds from IPO	$ 111,640
Underwriters exercised option to purchase additional shares (in shares)	673,764
Class A Common Stock | Continuing Equity Owner
Subsidiary, Sale of Stock [Line Items]
Shareholders ownership interest (percent)			0.80%