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Allowance For Doubtful Accounts And Credit Losses - Additional Information (Detail) (JPY ¥) In Millions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Allowance for Doubtful Accounts And Credit Losses [Line Items]
Repossessed assets	¥ 75	¥ 149

Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

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