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Leases - Lessee: Supplemental Cash Flow Information (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Schedule Of Cash Flow Information Related To Lease [Abstract]
Operating Leases, Cash flows from operating activities	¥ 52,277	¥ 52,759	¥ 50,369
Operating Leases, Cash flows from financing activities	0	0	0
Operating Leases, Right-of-use assets obtained in exchange for lease liabilities	54,161	27,427	39,823
Finance Leases, Cash flows from operating activities	67	84	150
Finance Leases, Cash flows from financing activities	725	664	781
Finance Leases, Right-of-use assets obtained in exchange for lease liabilities:	¥ 407	¥ 1,481	¥ 93

X

- Definition

Cash flow from financing activities operating lease

+ References

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- References

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X

- Definition

Amount of interest paid on finance lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (g)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-5

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X

- Definition

Amount of cash outflow for principal payment on finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (g)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
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-Section 45
-Paragraph 5
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-5

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- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

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Amount of increase in right-of-use asset obtained in exchange for finance lease liability.

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-Topic 842
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-Name Accounting Standards Codification
-Section 55
-Paragraph 53
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479589/842-20-55-53

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- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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-Topic 842
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-Paragraph 53
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479589/842-20-55-53

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-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

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