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Business and Summary of Significant Accounting Policies Warranty Liabilities (Tables)
 12 Months Ended
Dec. 30, 2017
Standard Product Warranty Disclosure [Abstract]  
Schedule of Product Warranty Liability [Table Text Block]
The activity in the accrued warranty liabilities account was as follows (in thousands): 
 
2017
 
2016
 
2015
Balance at beginning of period
$
8,633

 
$
10,028

 
$
5,824

Additions charged to costs and expenses for current-year sales
12,214

 
9,034

 
9,368

Deductions from reserves
(10,752
)
 
(10,016
)
 
(6,486
)
Changes in liability for pre-existing warranties during the current year, including expirations
(775
)
 
(413
)
 
1,322

Balance at end of period
$
9,320

 
$
8,633

 
$
10,028