Employee benefits - Summary of Weighted-Average Actuarial Assumptions Used to Determine the Present Value of Defined Benefit Obligations (Detail)	Mar. 31, 2024	Mar. 31, 2023
Japanese Defined Benefit Plans [Member]
Disclosure of significant weighted average actuarial assumptions used to determine the present value of defined benefit obligations explanatory [Line Items]
Actuarial assumption of discount rates	1.40%	1.10%
Foreign Defined Benefit Plan [Member]
Disclosure of significant weighted average actuarial assumptions used to determine the present value of defined benefit obligations explanatory [Line Items]
Actuarial assumption of discount rates	4.10%	4.30%

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 144
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_144&doctype=Standard
-URIDate 2023-03-23

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant