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SHARE-BASED COMPENSATION (Black-Scholes option pricing model for the stock option grants) (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) year	Jan. 01, 2017 CAD year
Share-based Payment Arrangements [Abstract]
Exercise price (in CAD per share)	$ 29.01	CAD 33.01
Risk-free interest rate	1.90%	0.66%
Expected volatility	20.78%	21.85%
Expected life	4.63	4.63
Expected dividend yield	1.29%	1.27%

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- Definition

Share-based Payment Arrangements [Abstract]

+ References

No definition available.

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- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 2
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- Definition

The option life of share options granted.

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The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

+ References

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The exercise price of share options granted.

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The percentage of an expected dividend used to calculate the fair value of share options granted.

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