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Pension Plans (Defined Benefit Plan Amount Recognized in Accumulated Other Comprehensive Income (Loss), Pre-tax) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2025	Mar. 31, 2024
Japan
Defined Benefit Plan Disclosure [Line Items]
Net prior service credit	¥ 666	¥ 1,016
Net actuarial gain (loss)	5,750	866
Net transition obligation	0	0
Total recognized in accumulated other comprehensive loss, pre-tax	6,416	1,882
Overseas plans
Defined Benefit Plan Disclosure [Line Items]
Net prior service credit	(502)	(28)
Net actuarial gain (loss)	12,865	9,735
Net transition obligation	8	7
Total recognized in accumulated other comprehensive loss, pre-tax	¥ 12,371	¥ 9,714

X

- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

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X

- Definition

Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

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- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

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- Definition

Amount, before tax, of accumulated other comprehensive income (loss) for transition asset (obligation) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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