Retirement And Pension Plans (Schedule Of Projected Benefit Obligations And Fair Value Of Plan Assets) (Detail) (JPY ¥) In Millions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Retirement And Pension Plans [Abstract]
Projected benefit obligations	¥ 190,257	¥ 180,868
Fair value of plan assets	161,505	138,986
Accumulated benefit obligations	183,707	175,419
Fair value of plan assets	¥ 156,934	¥ 135,314

If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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- Definition

If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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