Other Financial Assets - Summary of Fair Values at Date of Derecognition and Cumulative Net Gains or Losses Recognized in Other Comprehensive Income in Equity (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Disclosure of financial assets [abstract]
Fair value	¥ 36,911	¥ 61,586	¥ 2,452
Cumulative net gain or loss	¥ 26,292	¥ (55,090)	¥ (527)

The fair value at the date of the derecognition of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: Investments in equity instruments designated at fair value through other comprehensive income [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 11B
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_11B_b&doctype=Standard
-URIDate 2025-03-27

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