Consolidated Income Statements - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Principal gains, net	$ 1,145.2	$ 892.0	$ 622.2
Revenue from contract with customer	3,607.5	2,119.5	487.3
Interest income	219.0	102.4	130.9
Total revenues	66,036.0	42,534.2	54,139.6
Cost of sales of physical commodities	63,928.6	40,861.1	52,831.3
Operating revenues	2,107.4	1,673.1	1,308.3
Transaction-based clearing expenses	291.2	271.7	222.5
Introducing broker commissions	160.1	160.5	113.8
Interest expense	135.5	49.6	80.4
Interest expense on corporate funding	44.7	41.3	23.6
Net operating revenues	1,475.9	1,150.0	868.0
Compensation and other expenses:
Compensation and benefits	794.8	679.1	518.7
Trading systems and market information	66.2	58.8	46.3
Professional fees	54.3	40.9	30.2
Non-trading technology and support	52.4	46.0	28.4
Occupancy and equipment rental	36.1	34.2	23.5
Selling and marketing	55.3	33.3	12.2
Travel and business development	16.9	4.5	8.9
Communications	8.3	9.3	7.0
Depreciation and amortization	44.4	36.5	19.7
Bad debts, net of recoveries and impairment	15.8	10.4	18.7
Other	60.6	46.3	29.6
Total compensation and other expenses	1,205.1	999.3	743.2
Gain on acquisitions and other gains, net	6.4	3.4	81.9
Income from operations, before tax	277.2	154.1	206.7
Income tax expense	70.1	37.8	37.1
Net income	$ 207.1	$ 116.3	$ 169.6
Earnings per share:
Basic (in dollar per share)	$ 10.27	$ 5.90	$ 8.78
Diluted (in dollar per share)	$ 10.01	$ 5.74	$ 8.61
Weighted-average number of common shares outstanding:
Basic (in shares)	19,570,403	19,130,643	18,824,328
Diluted (in shares)	20,067,540	19,678,168	19,180,479
Sales of physical commodities
Revenues:
Sales of physical commodities	$ 64,052.6	$ 40,961.6	$ 52,899.2
Commission and clearing fees
Revenues:
Revenue from contract with customer	507.9	487.2	403.6
Consulting, management, and account fees
Revenues:
Revenue from contract with customer	$ 111.3	$ 91.0	$ 83.7