Warranty Reserves (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2014 years	Dec. 29, 2013	Dec. 30, 2012
Warranty reserve activity
Period of warranty protection beyond date of sale (in years)	1
Balance beginning of period	$ 10,534	$ 11,003	$ 10,412
Provision charged to income	17,447	17,291	17,750
Payments	(16,750)	(17,116)	(18,022)
Adjustments to previously provided warranties, net	73	(693)	801
Foreign currency and acquisitions	(521)	49	62
Balance end of period	$ 10,783	$ 10,534	$ 11,003