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Inventories	9 Months Ended
Inventories	May 31, 2013
Inventory Disclosure [Abstract]
Inventories	NOTE 3. INVENTORIES Inventories are stated at the lower of cost or market. Inventory cost for most domestic inventories is determined by the last-in-first-out ("LIFO") method. LIFO inventory reserves were $221.6 million and $261.8 million at May 31, 2013 and August 31, 2012, respectively. Inventory cost for international inventories and the remaining domestic inventories are determined by the first-in-first-out ("FIFO") method. At May 31, 2013 and August 31, 2012, 45% and 55%, respectively, of the Company's total inventories were valued at LIFO. The remainder of inventories, valued at FIFO, consisted mainly of material dedicated to CMC Poland Sp. z o.o. ("CMCP") (formerly CMC Zawiercie S.A. or CMCZ) and certain marketing and distribution businesses. The majority of the Company's inventories are in the form of finished goods with minimal work in process. At May 31, 2013 and August 31, 2012, $101.1 million and $68.0 million, respectively, were in the form of raw materials.

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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