Divestitures and assets held for sale (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 29, 2013 Manufacturing plants in China [Member] Plant	Dec. 28, 2012 Manufacturing plants in China [Member] Plant	Sep. 27, 2013 Land and building in Tunisia [Member]
Divestitures [Line Items]
Number of manufacturing plants under sales agreements		3
Number of manufacturing plants and related equipment sold	2	1
Gain from sale of assets held for sale	$ 0.2	$ 0.7
Cash deposits received from pending divestiture		6.1
Carrying value of remaining assets recorded in assets-held for sale related to sale of manufacturing plants		$ 5.7	$ 1.8