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Guarantees (Tables)
 12 Months Ended
Dec. 27, 2014
Text Block [Abstract]  
Activity Related to Product Warranty
Activity related to product warranty was as follows (in thousands):
 
 
December 27,
2014
 
December 28,
2013
Beginning balance
$
22,908

 
$
16,482

Charges to operations
22,697

 
21,193

Utilization
(10,860
)
 
(9,404
)
Change in estimate(1)
(7,705
)
 
(5,363
)
Balance at the end of the period
$
27,040

 
$
22,908

 
 
 
(1) 
The Company records hardware warranty liabilities based on the latest quality and cost information available as of that date. The changes in estimate shown here are due to changes in overall actual failure rates and the resulting impact of these changes on the Company’s estimate of expected future returns, as well as changes in the estimated cost and the mix of new versus used units related to replacement of failed units.