Income taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Details) $ in Millions	12 Months Ended
Mar. 31, 2024 CAD ($)
Changes in deferred tax liability (asset) [abstract]
Deferred tax assets, beginning balance	$ 67.5
Deferred tax liabilities, beginning balance	(16.4)
Net deferred tax assets, beginning balance	51.1
Change in the year affecting net income	7.3
Change in the year affecting foreign exchange translation	0.9
Change in the year affecting other comprehensive (loss) income	(0.2)
Deferred tax assets, ending balance	76.3
Deferred tax liabilities, ending balance	(17.2)
Net deferred tax assets, ending balance	59.1
Total deferred tax asset
Changes in deferred tax liability (asset) [abstract]
Deferred tax assets, beginning balance	81.7
Change in the year affecting net income	12.2
Change in the year affecting foreign exchange translation	0.9
Change in the year affecting other comprehensive (loss) income	0.1
Deferred tax assets, ending balance	94.9
Losses carried forward
Changes in deferred tax liability (asset) [abstract]
Deferred tax assets, beginning balance	11.5
Change in the year affecting net income	15.5
Change in the year affecting foreign exchange translation	0.0
Change in the year affecting other comprehensive (loss) income	0.0
Deferred tax assets, ending balance	27.0
Employee future benefits
Changes in deferred tax liability (asset) [abstract]
Deferred tax assets, beginning balance	0.1
Change in the year affecting net income	0.0
Change in the year affecting foreign exchange translation	0.0
Change in the year affecting other comprehensive (loss) income	0.1
Deferred tax assets, ending balance	0.2
Other liabilities
Changes in deferred tax liability (asset) [abstract]
Deferred tax assets, beginning balance	1.9
Change in the year affecting net income	5.0
Change in the year affecting foreign exchange translation	0.8
Change in the year affecting other comprehensive (loss) income	0.0
Deferred tax assets, ending balance	7.7
Inventory capitalization
Changes in deferred tax liability (asset) [abstract]
Deferred tax assets, beginning balance	6.8
Change in the year affecting net income	(4.2)
Change in the year affecting foreign exchange translation	0.0
Change in the year affecting other comprehensive (loss) income	0.0
Deferred tax assets, ending balance	2.6
Capital lease
Changes in deferred tax liability (asset) [abstract]
Deferred tax assets, beginning balance	9.3
Change in the year affecting net income	3.0
Change in the year affecting foreign exchange translation	0.0
Change in the year affecting other comprehensive (loss) income	0.0
Deferred tax assets, ending balance	12.3
Tax relief from Swiss tax reform
Changes in deferred tax liability (asset) [abstract]
Deferred tax assets, beginning balance	7.6
Change in the year affecting net income	(5.9)
Change in the year affecting foreign exchange translation	0.0
Change in the year affecting other comprehensive (loss) income	0.0
Deferred tax assets, ending balance	1.7
Unrealized profit in inventory
Changes in deferred tax liability (asset) [abstract]
Deferred tax assets, beginning balance	36.9
Change in the year affecting net income	(1.6)
Change in the year affecting foreign exchange translation	0.1
Change in the year affecting other comprehensive (loss) income	0.0
Deferred tax assets, ending balance	35.4
Provisions and other temporary differences
Changes in deferred tax liability (asset) [abstract]
Deferred tax assets, beginning balance	7.6
Change in the year affecting net income	0.4
Change in the year affecting foreign exchange translation	0.0
Change in the year affecting other comprehensive (loss) income	0.0
Deferred tax assets, ending balance	8.0
Total deferred tax liabilities
Changes in deferred tax liability (asset) [abstract]
Deferred tax liabilities, beginning balance	(30.6)
Change in the year affecting net income	(4.9)
Change in the year affecting foreign exchange translation	0.0
Change in the year affecting other comprehensive (loss) income	(0.3)
Deferred tax liabilities, ending balance	(35.8)
Unrealized foreign exchange
Changes in deferred tax liability (asset) [abstract]
Deferred tax liabilities, beginning balance	(3.1)
Change in the year affecting net income	0.7
Change in the year affecting foreign exchange translation	0.0
Change in the year affecting other comprehensive (loss) income	(0.3)
Deferred tax liabilities, ending balance	(2.7)
Intangible assets
Changes in deferred tax liability (asset) [abstract]
Deferred tax liabilities, beginning balance	(18.8)
Change in the year affecting net income	(0.8)
Change in the year affecting foreign exchange translation	0.0
Change in the year affecting other comprehensive (loss) income	0.0
Deferred tax liabilities, ending balance	(19.6)
Property, plant and equipment
Changes in deferred tax liability (asset) [abstract]
Deferred tax liabilities, beginning balance	(8.7)
Change in the year affecting net income	(4.8)
Change in the year affecting foreign exchange translation	0.0
Change in the year affecting other comprehensive (loss) income	0.0
Deferred tax liabilities, ending balance	$ (13.5)

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The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]]

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The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities]

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The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]]

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The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

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The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income]

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The increase (decrease) in deferred tax liability (asset) resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Deferred tax liability (asset)]

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