Deferred Income Tax - Additional Information (Detail) - JPY (¥) ¥ in Billions			12 Months Ended
Apr. 01, 2026	Apr. 01, 2025	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Disclosure of income tax expense [Line Items]
Increases in national corporation tax rate	4.00%
Deferred tax assets for deductible temporary differences related to investments in subsidiaries, associates and joint ventures			¥ 576	¥ 703
Temporary differences associated with investments in subsidiaries, associates and joint ventures for which deferred tax liabilities had not been recognized			¥ 7,378	¥ 5,826
Effective income tax rate	31.52%	30.62%	23.20%	21.10%	25.80%

The aggregate amount of temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements, for which deferred tax liabilities have not been recognised as a result of satisfying both of the following conditions: (a) the parent, investor, joint venturer or joint operator is able to control the timing of the reversal of the temporary difference; and (b) it is probable that the temporary difference will not reverse in the foreseeable future. [Refer: Total for all associates [member]; Total for all subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries reported in separate financial statements]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2025-01-01
-Paragraph 81
-Subparagraph f
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2025-en-r&anchor=para_81_f&doctype=Standard
-URIDate 2025-03-27

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant