Financial risk management objectives and policies - Schedule of Unrealized Losses in Fair Value of Cash Flow Hedges in Other Comprehensive Income (Details) - CAD ($) $ in Millions	12 Months Ended
Mar. 29, 2026	Mar. 30, 2025	Mar. 31, 2024
Disclosure of detailed information about hedges [line items]
Gains (losses) on cash flow hedges, net of tax	$ (3.5)	$ (13.3)	$ (0.5)
Foreign exchange risk \| Operating hedge program \| Cash flow hedges
Disclosure of detailed information about hedges [line items]
Gains (losses) on cash flow hedges, net of tax	0.9	(5.2)	1.3
Tax expense (recovery)	$ (0.5)	$ 0.4	$ 0.1

The gains (losses) recognised in other comprehensive income on cash flow hedges, net of tax, before reclassification adjustments. [Refer: Cash flow hedges [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 24C
-Subparagraph b
-Clause i
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-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 91
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-URIDate 2025-03-27

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration