Condensed Consolidated Income Statements Statement (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Revenues:
Sales of physical commodities	$ 12,587.9	$ 17,175.9
Trading gains	79.9	73.4
Commission and clearing fees	40.0	32.0
Consulting and management fees	8.3	6.2
Interest income	3.3	2.7
Other income	0.1	0.2
Total revenues	12,719.5	17,290.4
Cost of sales of physical commodities	12,593.8	17,194.1
Operating revenues	125.7	96.3
Interest expense	3.5	2.1
Net revenues	122.2	94.2
Non-interest expenses:
Compensation and benefits	46.7	45.8
Clearing and related expenses	25.0	22.7
Introducing broker commissions	8.4	5.8
Communication and data services	5.3	4.6
Occupancy and equipment rental	2.9	2.8
Professional fees	3.7	2.7
Depreciation and amortization	1.8	1.5
Bad debts and impairments	0.4	0.1
Other	9.2	8.9
Total non-interest expenses	103.4	94.9
Income from continuing operations, before tax	18.8	(0.7)
Income tax expense	5.5	(0.2)
Net income	13.3	(0.5)
Add: Net loss attributable to noncontrolling interests	0	0.1
Net income attributable to INTL FCStone Inc. common stockholders	$ 13.3	$ (0.4)
Basic earnings per share:
Net income attributable to INTL FCStone Inc. common stockholders	$ 0.70	$ (0.02)
Diluted earnings per share:
Net income attributable to INTL FCStone Inc. common stockholders	$ 0.68	$ (0.02)
Weighted-average number of common shares outstanding:
Basic	18,266,338	18,163,489
Diluted	18,778,675	18,163,489