Goodwill and intangible assets (Tables)

12 Months Ended

Dec. 29, 2012

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Goodwill [Table Text Block]

		December 29, 2012	December 31, 2011
		$	$
Goodwill		57,414	49,387
Intangible assets with a finite life at cost, less accumulated
	amortization of $24,300 (December 31, 2011 - $19,198)	52,885	48,035

The following is a summary of changes in goodwill:

			$
Balance at January 1, 2011			48,174
Acquisitions during the year			1,233
Additions during the year⁽¹⁾			249
Impact of foreign exchange			(269)
Balance at December 31, 2011			49,387
Acquisitions during the year			7,892
Additions during the year⁽¹⁾			250
Reduction during the year⁽²⁾			(251)
Impact of foreign exchange			136
Balance at December 29, 2012			57,414

Schedule Of Assumptions Used In Estimating Fair Value [Table Text Block]

Estimated cumulative average operating income growth (2011 - 2015)					47.4%
Projected long-term annual operating income growth⁽¹⁾					2.5%
Weighted-average discount rate⁽²⁾					15.0%

(1) Represents the operating income growth rate used to determine terminal value.

(2) Represents the targeted weighted-average discount rate of 11% plus the impact of a specific reporting unit risk premium to account for the estimated additional uncertainty associated with future cash flows.

Schedule of Finite-Lived Intangible Assets [Table Text Block]

The following is a summary of changes in intangible assets:

	Customer and other	Patents and
	relationships	trademarks	Other	Total
	$	$	$	$
Balance at January 1, 2011	48,763	649	2,999	52,411
Acquisitions (see note 2)	718	-	-	718
Additions	-	-	81	81
Impairments (see note 14)	-	-	(270)	(270)
Amortization	(3,674)	(103)	(679)	(4,456)
Impact of foreign exchange	(438)	-	(11)	(449)
Balance at December 31, 2011	45,369	546	2,120	48,035
Acquisitions (see note 2)	9,347	-	-	9,347
Additions	-	-	128	128
Amortization	(4,163)	(101)	(669)	(4,933)
Impact of foreign exchange	295	-	13	308
Balance at December 29, 2012	50,848	445	1,592	52,885

Schedule of Expected Amortization Expense [Table Text Block]

					$
2013					4,980
2014					4,851
2015					4,630
2016					4,354
2017					4,354
Thereafter					29,716
					52,885