CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (Unaudited) (Parenthetical) - $ / shares	Sep. 30, 2021	Sep. 30, 2020
Common stock, par value (USD per share)	$ 0.001
Common Stock
Common stock, par value (USD per share)	$ 0.001
Common Stock | Common Stock $0.001 Par Value
Common stock, par value (USD per share)		$ 0.001
Common Stock | Former IAC Common Stock $0.001 Par Value
Common stock, par value (USD per share)		0.001
Common Stock | Former IAC Class B Convertible Common Stock $0.001 Par Value
Common stock, par value (USD per share)		$ 0.001