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Life Insurance Operations - Additional Information (Detail) (JPY ¥) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
Net Investment Income [Line Items] |  |  |
Amortization of policy acquisition costs charged to income | ¥ 9,701 | ¥ 7,196 | ¥ 7,307

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