Financial instruments and fair values - Narrative (Details) ¥ in Millions, $ in Millions	12 Months Ended
Mar. 29, 2026 JPY (¥)	Mar. 29, 2026 CAD ($)	Mar. 30, 2025 JPY (¥)	Mar. 30, 2025 CAD ($)
Contingent consideration included in other long-term liabilities
Disclosure of fair value measurement of assets and liabilities [Line Items]
Gains (losses) recognised in profit or loss excluding exchange differences, fair value measurement, liabilities	¥ (93.5)	$ (0.9)	¥ (1,824.3)	$ (16.2)
Gains (losses) recognised in profit or loss on exchange differences, fair value measurement, liabilities		0.1		(0.1)
Put option liability included in other long-term liabilities
Disclosure of fair value measurement of assets and liabilities [Line Items]
Gains (losses) recognised in profit or loss excluding exchange differences, fair value measurement, liabilities	¥ 234.9	2.3	¥ 795.1	9.6
Gains (losses) recognised in profit or loss on exchange differences, fair value measurement, liabilities		$ 3.9		$ 2.2
Cash flow forecasts, term (in years)	10 years	10 years

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[Line Items] for Disclosure of fair value measurement of assets and liabilities [table]

+ References

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The gains (losses) excluding exchange differences, recognised in profit or loss, on the fair value measurement of liabilities. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 13
-IssueDate 2025-01-01
-Paragraph 93
-Subparagraph e
-Clause i
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-URIDate 2025-03-27

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The gains (losses) on exchange differences, recognised in profit or loss, on the fair value measurement of liabilities. [Refer: At fair value [member]]

+ References

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