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Effective Income Tax Rate Reconciliation, Impact of Tax Legislation

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Effective Income Tax Rate Reconciliation, Income Tax Expense (Benefit) Attributable to a Foreign Permanent Establishment

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Effective Income Tax Rate Reconciliation, Permanent Differences, Amount

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Effective Income Tax Rate Reconciliation, Unrealized Foreign Exchange Gains (Losses), Amount

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Effective Income Tax Rate Reconciliation, Withholding Taxes, Amount

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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

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Income Taxes (Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Canadian federal statutory rate, (percent)									26.70%	26.50%	26.50%
Income tax expense computed at statutory income tax rate									$ 17,702	$ 31,895	$ 34,477
Foreign rate differential									(4,503)	(4,926)	2,772
Permanent differences									1,195	(1,822)	1,527
Disposal of subsidiaries									2,751	(21)	(160)
Income attributable to a permanent establishment									148	1,873	347
Change in valuation allowance									(1,463)	3,878	(27,603)
Tax exempt income									(2,451)	(5,673)	(6,469)
Share based compensation									(341)	(737)	(7,583)
Income tax credits									(1,869)	(3,252)	(1,833)
Foreign exchange gains (losses)									(991)	(2,683)	770
Unrecognized tax benefits									(848)	646	(116)
Change in tax rate									267	(284)	1,209
Change in tax rate due to U.S. reform									0	0	(27,138)
Limitation on executive compensation									773	2,038	0
Withholding and other taxes									2,006	3,631	1,943
Nondeductible interest									4,814	0	0
Other									119	(750)	297
Income tax expense (benefit)	$ 2,624	$ 4,334	$ 10,293	$ 58	$ 3,067	$ 6,151	$ 7,894	$ 6,701	17,309	23,813	(27,560)
Deferred tax asset, valuation allowance	$ 15,569				$ 16,373				$ 15,569	$ 16,373	$ 13,912	$ 36,800