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INCOME TAXES (Changes to deferred income tax assets and liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017
Reconciliation of changes in deferred tax liability (asset) [abstract]
Balance, beginning of fiscal year, net	$ 1,500	$ 2,793
Changes in deferred tax liability (asset) [abstract]
Recognized in the statements of earnings	(4,895)	3,156
Business acquisitions	0	(4,542)
Other	(318)	93
Balance, end of fiscal year, net	(3,713)	1,500
Non-capital losses
Changes in deferred tax liability (asset) [abstract]
Recognized in the statements of earnings	31,202	9,847
Non-deductible reserves and accruals
Changes in deferred tax liability (asset) [abstract]
Recognized in the statements of earnings	(41,052)	3,004
Property, plant and equipment
Changes in deferred tax liability (asset) [abstract]
Recognized in the statements of earnings	(3,062)	(11,438)
Intangible assets
Changes in deferred tax liability (asset) [abstract]
Recognized in the statements of earnings	66,888	498
Other
Changes in deferred tax liability (asset) [abstract]
Recognized in the statements of earnings	1,984	2,790
Change In Tax Rate Related Temporary Differences [Member]
Changes in deferred tax liability (asset) [abstract]
Recognized in the statements of earnings	1,633	0
Unrecognized deferred tax assets
Changes in deferred tax liability (asset) [abstract]
Recognized in the statements of earnings	$ (62,488)	$ (1,545)

X

- Definition

Increase (Decrease) Through Other, Deferred Tax Liability (Asset)

+ References

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- Definition

The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2017-01-01
-Paragraph 81
-Subparagraph g
-Clause ii
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- Definition

The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2017-01-01
-Paragraph 81
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- Definition

The increase (decrease) in deferred tax liability (asset) resulting from business combinations. [Refer: Deferred tax liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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