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Income taxes (Tables)
12 Months Ended
Dec. 29, 2018
Income Tax Disclosure [Abstract]  
Schedule Of Earnings And Provision Recovery Of Income Taxes [Table Text Block]

The recovery of income taxes differs from the amount that would have resulted from applying the combined Canadian federal and provincial statutory income tax rate to loss from continuing operations before income taxes due to the following:

December 29, 2018December 30, 2017December 31, 2016
$$$
Loss from continuing operations before income taxes(114,521)(170,397)(74,361)
Canadian statutory rate26.5%26.5%26.5%
Income tax recovery at statutory rate(30,348)(45,155)(19,706)
Impact of changes in enacted tax rates1,976(8,437)90
Foreign tax rate differential2,562(9,324)(11,329)
Change in unrecognized tax benefits-(452)(1,268)
Goodwill impairment loss22,23930,4756,841
Impact of stock-based compensation and other non-
deductible expenses2,0191,5901,238
Change in valuation allowance(3,717)72(267)
Other(109)(4,598)604
Recovery of income taxes(5,378)(35,829)(23,797)

The components of loss from continuing operations before income taxes are shown below:
December 29, 2018December 30, 2017December 31, 2016
$$$
Canada(13,408)(3,286)9,811
U.S.(107,068)(178,033)(93,941)
Other5,95510,9229,769
(114,521)(170,397)(74,361)
The components of the provision for (recovery of) income taxes are shown below:
December 29, 2018December 30, 2017December 31, 2016
$$$
Current income tax provision (recovery):
Canada(1,334)(658)3,560
U.S.(3,655)(10,346)(1,293)
Other3,3943,0743,664
(1,595)(7,930)5,931
Deferred income tax provision (recovery):
Canada547642(12)
U.S.(4,226)(28,606)(29,463)
Other(104)65(253)
(3,783)(27,899)(29,728)
Recovery of income taxes(5,378)(35,829)(23,797)
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Deferred income taxes of the Company are comprised of the following:
December 29, 2018December 30, 2017
$$
Differences in property, plant and equipment
and intangible assets(54,841)(51,093)
Capital and non-capital losses25,16922,144
Tax benefit of scientific research expenditures2,0041,871
Inventory basis differences3,7555,193
Interest expense limitation (163j)20,02510,311
Other accrued reserves1,3665,249
(2,522)(6,325)
Less: valuation allowance5,4459,162
Net deferred income tax liability(7,967)(15,487)
Schedule Of Deferred Tax Assets And Liabilities By Geographic Segment [Table Text Block]
The components of the net deferred income tax asset (liability) are shown below:
December 29, 2018December 30, 2017
$$
Canada(148)362
U.S.(7,147)(14,892)
Other(672)(957)
(7,967)(15,487)
Schedule Of Deferred Income Tax Valuation Allowance [Table Text Block]
The components of the deferred income tax valuation allowance are as follows:
December 29, 2018December 30, 2017
$$
Balance, beginning of year9,1629,090
Increase (decrease) in valuation allowance(3,717)72
Balance, end of year5,4459,162
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

A reconciliation of the beginning and ending amount of unrecognized tax benefits (excluding interest and penalties) is presented below:

December 29, 2018December 30, 2017
$$
Balance, beginning of year-452
Reductions in tax positions of prior years-(452)
Balance, end of year--