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Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($) | Sep. 29, 2023 | Mar. 31, 2022 | Jan. 11, 2022 | Sep. 07, 2021 | Aug. 06, 2021 | Aug. 10, 2020 | Sep. 30, 2023
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Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Guarantees, Fair Value Disclosure |  |  |  |  |  |  | $ 0
Trading Technologies Matter [Member] |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Damages sought |  |  |  |  | $ 962,400,000 |  |
Damage awarded |  | $ 490,232 | $ 2,100,000 | $ 6,600,000 |  |  |
FINRA [Member] |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Settlement, penalties agreed to paid |  |  |  |  |  | $ 15,000,000 |
SEC [Member] |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Settlement, penalties agreed to paid | $ 35,000,000 |  |  |  |  | 11,500,000 |
CFTC [Member] |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Settlement, penalties agreed to paid | $ 20,000,000 |  |  |  |  | 11,500,000 |
Disgorgement [Member] |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Settlement, penalties agreed to paid |  |  |  |  |  | $ 700,000 |

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- Definition Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services. + References No definition available. + Details
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- Definition Amount of damages awarded to the plaintiff in the legal matter. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-4 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-9 + Details
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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-4 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-9 + Details
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