Capital Requirements (Details) - USD ($)	Jan. 03, 2022	Dec. 31, 2021	Jan. 02, 2021	Dec. 31, 2020
MSCO [Member]
Net capital		$ 36,400,000		$ 27,500,000
Minimum net capital required		2,100,000		2,300,000
Net capital in excess of minimum requirement		$ 34,300,000		$ 25,200,000
Percentage of aggregate debit balance to net capital		34.90%		24.30%
Cash deposits		$ 326,800,000		$ 324,900,000
Minimum cash deposits required		294,900,000		319,900,000
Cash deposits in excess of minimum requirement		31,900,000	$ 1,000,000.0	5,000,000.0
MSCO [Member] | Subsequent Event [Member]
Cash deposits in excess of minimum requirement	$ 1,900,000
RISE [Member]
Minimum net capital required		250,000		250,000
RISE [Member] | Minimum [Member]
Net capital		1,700,000		3,900,000
RISE [Member] | Maximum [Member]
Net capital		$ 1,400,000		$ 3,700,000