Physical Commodities Inventory (Notes)	3 Months Ended
Physical Commodities Inventory (Notes)	Dec. 31, 2014
Physical Commodities Inventory [Abstract]
Inventory Disclosure [Text Block]	Physical Commodities Inventory Physical commodities inventories are stated at the lower of cost or market (“LCM”) using the weighted-average price and first-in first-out cost method. Cost includes finished commodity or raw material and processing costs related to the purchase and processing of inventories. The carrying values of the Company’s inventory, which consist of all finished commodities inventory, are $45.1 million and $40.0 million as of December 31, 2014 and September 30, 2014, respectively. As a result of the declining market prices of certain commodities, the Company has recorded LCM adjustments for physical commodities inventory of $0.8 million and $1.0 million as of December 31, 2014 and September 30, 2014, respectively. The adjustments are included in ‘cost of sales of physical commodities’ in the condensed consolidated income statements.

The entire disclosure for inventory. This may include, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the major classes of inventory, and the nature of the cost elements included in inventory. If inventory is stated above cost, accrued net losses on firm purchase commitments for inventory and losses resulting from valuing inventory at the lower-of-cost-or-market may also be included. For LIFO inventory, may disclose the amount and basis for determining the excess of replacement or current cost over stated LIFO value and the effects of a LIFO quantities liquidation that impacts net income.

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