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Subsequent Events (Details) - USD ($)					1 Months Ended		3 Months Ended			9 Months Ended
	Oct. 29, 2025	Oct. 06, 2025	May 19, 2025	May 16, 2025	Sep. 30, 2025	Aug. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Subsequent Event
Dividends declared per share of common stock (in dollars per share)							$ 0.03		$ 0.03	$ 0.09	$ 0.09
Class A Common Stock
Subsequent Event
Treasury stock repurchases (in shares)					0	0	0	10,839,674	6,779,828	10,839,674	15,745,930
Sale of Class A Common Stock to Company | Mr. Lutnick
Subsequent Event
Treasury stock repurchases (in shares)				10,969,533
Howard W. Lutnick, Spouse and Trusts | Sale of Class A Common Stock to Company | Mr. Lutnick
Subsequent Event
Treasury stock repurchases (in shares)			10,839,674	129,859
Spouse | Sale of Class A Common Stock to Company | Mr. Lutnick
Subsequent Event
Treasury stock repurchases (in shares)				2,573
Subsequent Event | Class A Common Stock
Subsequent Event
Dividends declared per share of common stock (in dollars per share)	$ 0.03
Subsequent Event | Class B Common Stock
Subsequent Event
Dividends declared per share of common stock (in dollars per share)	$ 0.03
Subsequent Event | Sale of Class A Common Stock to Company | Mr. Lutnick
Subsequent Event
Treasury stock repurchases		$ 13,096,795.7
Subsequent Event | CF Group Management, Inc. | Sale of Class A Common Stock to Company | Mr. Lutnick
Subsequent Event
Treasury stock repurchases		$ 200,000
Subsequent Event | Spouse | Sale of Class A Common Stock to Company | Mr. Lutnick
Subsequent Event
Treasury stock repurchases (in shares)		4,400

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Aggregate dividends declared during the period for each share of common stock outstanding.

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