Accounting policies (Policy)	9 Months Ended
Sep. 28, 2013
Accounting Policies [Abstract]
Basis of Accounting [Text Block]	The interim consolidated financial statements of the Company have been prepared in accordance with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X promulgated under the Securities Exchange Act of 1934, as amended, and in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information. Accordingly, these condensed interim consolidated financial statements do not include all of the disclosures required by U.S. GAAP for annual financial statements. In the opinion of management, all adjustments considered necessary for fair presentation have been included and all such adjustments are of a normal, recurring nature. Operating results for the quarter and three quarters ended September 28, 2013 are not necessarily indicative of the results that may be expected for the full year ending December 28, 2013 or for any other period. The interim consolidated financial statements include the accounts of the Company and its subsidiaries, and have been prepared on a basis consistent with the annual consolidated financial statements for the year ended December 29, 2012. For further information, refer to the consolidated financial statements, and notes thereto, included in the Company's Annual Report on Form 10-K for the fiscal year ended December 29, 2012.

Accounting policies (Policy)

9 Months Ended

Sep. 28, 2013

The interim consolidated financial statements of the Company have been prepared in accordance with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X promulgated under the Securities Exchange Act of 1934, as amended, and in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information. Accordingly, these condensed interim consolidated financial statements do not include all of the disclosures required by U.S. GAAP for annual financial statements. In the opinion of management, all adjustments considered necessary for fair presentation have been included and all such adjustments are of a normal, recurring nature. Operating results for the quarter and three quarters ended September 28, 2013 are not necessarily indicative of the results that may be expected for the full year ending December 28, 2013 or for any other period. The interim consolidated financial statements include the accounts of the Company and its subsidiaries, and have been prepared on a basis consistent with the annual consolidated financial statements for the year ended December 29, 2012. For further information, refer to the consolidated financial statements, and notes thereto, included in the Company's Annual Report on Form 10-K for the fiscal year ended December 29, 2012.