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Goodwill and intangible assets (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 CAD ($) | Sep. 30, 2017 CAD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($)
Reconciliation of carrying amount [Line Items] |  |  |  |  |
Intangible assets, beginning of year |  |  |  | $ 70,012,000 |
Intangible assets, end of year | $ 70,012,000 |  |  | 65,602,000 | $ 70,012,000
Cost [Member] |  |  |  |  |
Reconciliation of carrying amount [Line Items] |  |  |  |  |
Intangible assets, beginning of year |  |  |  | 350,996,000 | 366,753,000
Effect of movements in exchange rates |  |  |  | 9,559,000 | (15,757,000)
Intangible assets, end of year | 350,996,000 |  |  | 360,555,000 | 350,996,000
Accumulated amortization [member] |  |  |  |  |
Reconciliation of carrying amount [Line Items] |  |  |  |  |
Intangible assets, beginning of year |  |  |  | 280,984,000 | 163,443,000
Amortization charge |  |  |  | 4,799,000 | 6,723,000
Impairment charge |  |  |  | 0 | 118,549,000
Effect of movements in exchange rates |  |  |  | 9,170,000 | (7,731,000)
Intangible assets, end of year | 280,984,000 |  |  | 294,953,000 | 280,984,000
Goodwill [Member] |  |  |  |  |
Reconciliation of carrying amount [Line Items] |  |  |  |  |
Intangible assets, beginning of year |  |  |  | 0 |
Intangible assets, end of year | 0 |  |  | 0 | 0
Goodwill [Member] | Nukem [Member] |  |  |  |  |
Reconciliation of carrying amount [Line Items] |  |  |  |  |
Impairment charge |  | $ 111,399,000 | $ 88,377,000 |  |
Goodwill [Member] | Cost [Member] |  |  |  |  |
Reconciliation of carrying amount [Line Items] |  |  |  |  |
Intangible assets, beginning of year |  |  |  | 111,399,000 | 118,664,000
Effect of movements in exchange rates |  |  |  | 0 | (7,265,000)
Intangible assets, end of year | 111,399,000 |  |  | 111,399,000 | 111,399,000
Goodwill [Member] | Accumulated amortization [member] |  |  |  |  |
Reconciliation of carrying amount [Line Items] |  |  |  |  |
Intangible assets, beginning of year |  |  |  | 111,399,000 | 0
Amortization charge |  |  |  | 0 | 0
Impairment charge |  |  |  | 0 | 111,399,000
Effect of movements in exchange rates |  |  |  | 0 | 0
Intangible assets, end of year | 111,399,000 |  |  | 111,399,000 | 111,399,000
Contracts [member] |  |  |  |  |
Reconciliation of carrying amount [Line Items] |  |  |  |  |
Intangible assets, beginning of year |  |  |  | 4,873,000 |
Intangible assets, end of year | 4,873,000 |  |  | 3,937,000 | 4,873,000
Contracts [member] | Cost [Member] |  |  |  |  |
Reconciliation of carrying amount [Line Items] |  |  |  |  |
Intangible assets, beginning of year |  |  |  | 109,812,000 | 117,533,000
Effect of movements in exchange rates |  |  |  | 9,559,000 | (7,721,000)
Intangible assets, end of year | 109,812,000 |  |  | 119,371,000 | 109,812,000
Contracts [member] | Accumulated amortization [member] |  |  |  |  |
Reconciliation of carrying amount [Line Items] |  |  |  |  |
Intangible assets, beginning of year |  |  |  | 104,939,000 | 110,284,000
Amortization charge |  |  |  | 1,325,000 | 2,002,000
Impairment charge |  |  |  | 0 | 0
Effect of movements in exchange rates |  |  |  | 9,170,000 | (7,347,000)
Intangible assets, end of year | 104,939,000 |  |  | 115,434,000 | 104,939,000
Intellectual Property [member] |  |  |  |  |
Reconciliation of carrying amount [Line Items] |  |  |  |  |
Intangible assets, beginning of year |  |  |  | 65,139,000 |
Intangible assets, end of year | 65,139,000 |  |  | 61,665,000 | 65,139,000
Intellectual Property [member] | Cost [Member] |  |  |  |  |
Reconciliation of carrying amount [Line Items] |  |  |  |  |
Intangible assets, beginning of year |  |  |  | 118,819,000 | 118,819,000
Effect of movements in exchange rates |  |  |  | 0 | 0
Intangible assets, end of year | 118,819,000 |  |  | 118,819,000 | 118,819,000
Intellectual Property [member] | Accumulated amortization [member] |  |  |  |  |
Reconciliation of carrying amount [Line Items] |  |  |  |  |
Intangible assets, beginning of year |  |  |  | 53,680,000 | 49,589,000
Amortization charge |  |  |  | 3,474,000 | 4,091,000
Impairment charge |  |  |  | 0 | 0
Effect of movements in exchange rates |  |  |  | 0 | 0
Intangible assets, end of year | 53,680,000 |  |  | 57,154,000 | 53,680,000
Patents [member] |  |  |  |  |
Reconciliation of carrying amount [Line Items] |  |  |  |  |
Intangible assets, beginning of year |  |  |  | 0 |
Intangible assets, end of year | 0 |  |  | 0 | 0
Patents [member] | UFP Investments LLC [Member] |  |  |  |  |
Reconciliation of carrying amount [Line Items] |  |  |  |  |
Impairment charge | 7,150,000 |  |  |  |
Patents [member] | Cost [Member] |  |  |  |  |
Reconciliation of carrying amount [Line Items] |  |  |  |  |
Intangible assets, beginning of year |  |  |  | 10,966,000 | 11,737,000
Effect of movements in exchange rates |  |  |  | 0 | (771,000)
Intangible assets, end of year | 10,966,000 |  |  | 10,966,000 | 10,966,000
Patents [member] | Accumulated amortization [member] |  |  |  |  |
Reconciliation of carrying amount [Line Items] |  |  |  |  |
Intangible assets, beginning of year |  |  |  | 10,966,000 | 3,570,000
Amortization charge |  |  |  | 0 | 630,000
Impairment charge |  |  |  | 0 | 7,150,000
Effect of movements in exchange rates |  |  |  | 0 | (384,000)
Intangible assets, end of year | $ 10,966,000 |  |  | $ 10,966,000 | $ 10,966,000

X
- Definition The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_vi&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of impairment loss recognised in profit or loss for intangible assets and goodwill. [Refer: Impairment loss recognised in profit or loss; Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_iv&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of intangible assets and goodwill held by the entity. [Refer: Goodwill; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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