Commitments and contingencies (Tables)

12 Months Ended

Dec. 28, 2013

Commitments And Contingencies Disclosure [Abstract]

Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]

	$
2013	15,606
2014	13,189
2015	11,066
2016	9,953
2017	10,068
Thereafter	10,705
	70,587