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Redeemable Noncontrolling Interests (Changes in Redeemable Noncontrolling Interests) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Statement of Stockholders' Equity [Abstract]
Beginning Balance	¥ 0	¥ 0	¥ 10,331
Transaction with noncontrolling interests	959	0	(10,028)
Adjustment of redeemable noncontrolling interests to redemption value	3	0	0
Comprehensive income (loss)
Net Income (loss)	32	0	(23)
Other comprehensive income (loss)
Net unrealized gains (losses) on investment in debt securities	(24)	0	0
Net change of foreign currency translation adjustments	(25)	0	(280)
Total other comprehensive income (loss)	(49)	0	(280)
Comprehensive income (loss)	(17)	0	(303)
Ending Balance	¥ 945	¥ 0	¥ 0

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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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 adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to noncontrolling interest. Excludes amounts related to other than temporary impairment (OTTI) loss.

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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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