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Product Warranty (Tables)
9 Months Ended
Sep. 27, 2020
Other Accrued Liabilities Related costs are charged to the warranty accrual as incurred. The balance below is included in other accrued liabilities.
    
For the Three Months

Ended
    
For the Nine Months

Ended
 
    
September 27,
    
September 29,
    
September 27,
    
September 29,
 
    
2020
    
2019
    
2020
    
2019
 
    
(in thousands)
 
Balance at beginning of period
   $ 13,016      $ 8,133      $ 8,996      $ 7,909  
Acquisition
     —          —                 14  
Accruals for warranties issued during the period
     8,255        3,508        19,522        10,008  
Accruals related to
pre-existing
warranties
     158        1,132        1,569        3,156  
Settlements made during the period
     (6,272      (4,265      (14,930      (12,579
  
 
 
    
 
 
    
 
 
    
 
 
 
Balance at end of period
   $ 15,157      $ 8,508      $ 15,157      $ 8,508  
  
 
 
    
 
 
    
 
 
    
 
 
 
Extended Product Warranty of Short and Long-Term Deferred Revenue and Customer Advances The balance below is included in short and long-term deferred revenue and customer advances.
    
For the Three Months

Ended
    
For the Nine Months

Ended
 
    
September 27,
    
September 29,
    
September 27,
    
September 29,
 
    
2020
    
2019
    
2020
    
2019
 
    
(in thousands)
 
Balance at beginning of period
   $ 40,178      $ 28,716      $ 30,677      $ 27,422  
Deferral of new extended warranty revenue
     13,674        5,666        32,724        16,962  
Recognition of extended warranty deferred revenue
     (5,149      (4,445      (14,698      (14,447
  
 
 
    
 
 
    
 
 
    
 
 
 
Balance at end of period
   $ 48,703      $ 29,937      $ 48,703      $ 29,937