Retirement And Pension Plans (Schedule Of Projected Benefit Obligations And Fair Value Of Plan Assets) (Detail) (JPY ¥) In Millions, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Retirement And Pension Plans [Abstract]
Projected benefit obligations	¥ 180,868	¥ 163,060
Fair value of plan assets	138,986	127,775
Accumulated benefit obligations	175,419	161,322
Fair value of plan assets	¥ 135,314	¥ 126,380

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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