Retirement And Pension Plans (Schedule Of Estimated Prior Service Benefit And Actuarial Loss) (Detail) (JPY ¥) In Millions, unless otherwise specified	12 Months Ended
Mar. 31, 2012
Retirement And Pension Plans [Abstract]
Prior service benefit	¥ (808)
Actuarial loss	¥ 6,092

The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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The amounts in accumulated other comprehensive income related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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