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Redeemable Noncontrolling Interests (Changes in Redeemable Noncontrolling Interests) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Beginning Balance	¥ 2,645	¥ 945	¥ 0
Transaction with noncontrolling interests	1,963	2,122	959
Adjustment of redeemable noncontrolling interests to redemption value	0	0	3
Comprehensive income (loss)
Net Income	394	137	32
Other comprehensive income (loss)
Net change of unrealized gains (losses) on investment in securities	0	10	(24)
Net change of foreign currency translation adjustments	(50)	203	(25)
Total other comprehensive income (loss)	(50)	213	(49)
Comprehensive income (loss)	344	350	(17)
Dividends	(1,520)	(772)	0
Ending Balance	¥ 3,432	¥ 2,645	¥ 945

X

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to redeemable noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Foreign Currency Translation Effects Attributable to Redeemable Noncontrolling Interests

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Minority non controlling interests.

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Other Comprehensive Income Loss Net Of Tax Period Increase Decrease Portion Attributable To Redeemable Noncontrolling Interest

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Other Comprehensive Income Loss Net Of Tax Period Increase Decrease Portion Attributable To Redeemable Noncontrolling Interest [Abstract]

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Redeemable noncontrolling interests dividends.

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Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest.

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Amount after tax of income (loss) attributable to other redeemable noncontrolling equity holder.

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Amount, after tax and reclassification adjustment, of gain (loss) in value of unsold investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), attributable to noncontrolling interest.

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The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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