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Inventories (Schedule Of Inventory) (Detail) (JPY ¥) In Millions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Inventories [Abstract]
Finished products	¥ 133,974	¥ 119,446
Spare parts	30,626	25,640
Work in process	34,961	31,495
Raw materials and supplies	31,927	25,489
Total inventory, net	¥ 231,488	¥ 202,070

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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