Plant and equipment (Details) - USD ($) | 2 Months Ended | 3 Months Ended | 22 Months Ended |
Dec. 31, 2022 | Oct. 31, 2021 | Oct. 31, 2022 |
Reconciliation of changes in property, plant and equipment [abstract] | | | |
Property, plant and equipment at beginning of period | $ 147,700,000 | | |
Property, plant and equipment at end of period | 210,400,000 | | $ 147,700,000 |
Employee salaries capitalized to assets under construction | 1,400,000 | $ 0 | |
Share-based compensation cost capitalized to assets under construction | 100,000 | | |
Borrowing costs capitalised | $ 3,500,000 | 0 | |
Capitalisation rate of borrowing costs eligible for capitalisation | 12.60% | | |
Construction in progress | | | |
Reconciliation of changes in property, plant and equipment [abstract] | | | |
Property, plant and equipment at beginning of period | $ 107,400,000 | | |
Property, plant and equipment at end of period | 167,100,000 | | 107,400,000 |
Machinery | | | |
Reconciliation of changes in property, plant and equipment [abstract] | | | |
Property, plant and equipment at beginning of period | 30,000,000 | | |
Property, plant and equipment at end of period | 32,900,000 | | 30,000,000 |
Computer equipment | | | |
Reconciliation of changes in property, plant and equipment [abstract] | | | |
Property, plant and equipment at beginning of period | 1,600,000 | | |
Property, plant and equipment at end of period | 1,800,000 | | 1,600,000 |
Vehicles | | | |
Reconciliation of changes in property, plant and equipment [abstract] | | | |
Property, plant and equipment at beginning of period | 200,000 | | |
Property, plant and equipment at end of period | 200,000 | | 200,000 |
Leasehold improvements | | | |
Reconciliation of changes in property, plant and equipment [abstract] | | | |
Property, plant and equipment at beginning of period | 8,500,000 | | |
Property, plant and equipment at end of period | 8,400,000 | | 8,500,000 |
Gross carrying amount | | | |
Reconciliation of changes in property, plant and equipment [abstract] | | | |
Property, plant and equipment at beginning of period | 153,600,000 | | |
Additions other than through business combinations, property, plant and equipment | 64,000,000 | | 125,000,000 |
Increase (decrease) through transfers from construction in progress, property, plant and equipment | 0 | | 0 |
Property, plant and equipment at end of period | 217,600,000 | 28,600,000 | 153,600,000 |
Gross carrying amount | Construction in progress | | | |
Reconciliation of changes in property, plant and equipment [abstract] | | | |
Property, plant and equipment at beginning of period | 107,400,000 | | |
Additions other than through business combinations, property, plant and equipment | 63,600,000 | | 119,500,000 |
Increase (decrease) through transfers from construction in progress, property, plant and equipment | (3,900,000) | | (27,700,000) |
Property, plant and equipment at end of period | 167,100,000 | 15,600,000 | 107,400,000 |
Gross carrying amount | Machinery | | | |
Reconciliation of changes in property, plant and equipment [abstract] | | | |
Property, plant and equipment at beginning of period | 34,300,000 | | |
Additions other than through business combinations, property, plant and equipment | 0 | | 200,000 |
Increase (decrease) through transfers from construction in progress, property, plant and equipment | 3,900,000 | | 27,700,000 |
Property, plant and equipment at end of period | 38,200,000 | 6,400,000 | 34,300,000 |
Gross carrying amount | Computer equipment | | | |
Reconciliation of changes in property, plant and equipment [abstract] | | | |
Property, plant and equipment at beginning of period | 1,800,000 | | |
Additions other than through business combinations, property, plant and equipment | 300,000 | | 1,600,000 |
Increase (decrease) through transfers from construction in progress, property, plant and equipment | 0 | | 0 |
Property, plant and equipment at end of period | 2,100,000 | 200,000 | 1,800,000 |
Gross carrying amount | Vehicles | | | |
Reconciliation of changes in property, plant and equipment [abstract] | | | |
Property, plant and equipment at beginning of period | 300,000 | | |
Additions other than through business combinations, property, plant and equipment | 0 | | 100,000 |
Property, plant and equipment at end of period | 300,000 | 200,000 | 300,000 |
Gross carrying amount | Leasehold improvements | | | |
Reconciliation of changes in property, plant and equipment [abstract] | | | |
Property, plant and equipment at beginning of period | 9,800,000 | | |
Additions other than through business combinations, property, plant and equipment | 100,000 | | 3,600,000 |
Property, plant and equipment at end of period | 9,900,000 | 6,200,000 | 9,800,000 |
Accumulated depreciation | | | |
Reconciliation of changes in property, plant and equipment [abstract] | | | |
Property, plant and equipment at beginning of period | (5,900,000) | | |
Depreciation | (1,300,000) | | (3,700,000) |
Property, plant and equipment at end of period | (7,200,000) | (2,200,000) | (5,900,000) |
Accumulated depreciation | Construction in progress | | | |
Reconciliation of changes in property, plant and equipment [abstract] | | | |
Property, plant and equipment at beginning of period | 0 | | |
Depreciation | 0 | | 0 |
Property, plant and equipment at end of period | 0 | 0 | 0 |
Accumulated depreciation | Machinery | | | |
Reconciliation of changes in property, plant and equipment [abstract] | | | |
Property, plant and equipment at beginning of period | (4,300,000) | | |
Depreciation | (1,000,000) | | (2,700,000) |
Property, plant and equipment at end of period | (5,300,000) | (1,600,000) | (4,300,000) |
Accumulated depreciation | Computer equipment | | | |
Reconciliation of changes in property, plant and equipment [abstract] | | | |
Property, plant and equipment at beginning of period | (200,000) | | |
Depreciation | (100,000) | | (200,000) |
Property, plant and equipment at end of period | (300,000) | 0 | (200,000) |
Accumulated depreciation | Vehicles | | | |
Reconciliation of changes in property, plant and equipment [abstract] | | | |
Property, plant and equipment at beginning of period | (100,000) | | |
Depreciation | 0 | | 0 |
Property, plant and equipment at end of period | (100,000) | (100,000) | (100,000) |
Accumulated depreciation | Leasehold improvements | | | |
Reconciliation of changes in property, plant and equipment [abstract] | | | |
Property, plant and equipment at beginning of period | (1,300,000) | | |
Depreciation | (200,000) | | (800,000) |
Property, plant and equipment at end of period | $ (1,500,000) | $ (500,000) | $ (1,300,000) |