Income taxes - Income tax reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2018
Income taxes
Combined federal and provincial statutory tax rate	27.00%	27.00%	26.92%
Income tax (recovery) at statutory rate	$ 43,677	$ (7,534)	$ (5,882)
Difference in foreign tax rates	2,424	(281)	(424)
Impact of change in tax rate			23,582
Effect of foreign exchange changes	(4)
Non-deductible expenditures	1,009	4,061	3,018
Income from option payments applied as proceeds of sale	(8,812)
Return to provision adjustments	(6)	193	1,319
Impact of new lease accounting rules (ASC 842 adoption)	(28)
Expiry of losses		277
Change in valuation allowance	(38,260)	3,284	(21,613)
Income tax recovery (expense)	$ 0	$ 0	$ 0

Percentage of domestic federal and provincial statutory tax rate applicable to pretax income (loss).

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to income from option payments.

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Represents the impact of new lease accounting rules.

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Represents effect of foreign exchange changes.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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