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Summary of Significant Accounting Policies (Details 4) - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]      
Balance - beginning of period $ 37,233 $ 30,449 $ 27,609
Accrual for products sold [1] 56,360 61,578 44,620
Expenditures (56,766) (54,794) (41,780)
Balance - end of period $ 36,827 $ 37,233 $ 30,449
[1] Changes in cost estimates related to pre-existing warranties are not material and aggregated with accruals for new warranty contracts in the 'accrual for products sold' line.