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Deferred Revenue and Customer Advances
3 Months Ended
Apr. 04, 2021
Deferred Revenue and Customer Advances
I. DEFERRED REVENUE AND CUSTOMER ADVANCES
Deferred revenue and customer advances consist of the following and are included in short and long-term deferred revenue and customer advances on the balance sheet:
 
    
April 4,
    
December 31,
 
    
2021
    
2020
 
    
(in thousands)
 
Maintenance, service and training
   $ 78,321      $ 77,654  
Customer advances, undelivered elements and other
     67,721        63,438  
Extended warranty
     53,908        51,929  
    
 
 
    
 
 
 
Total deferred revenue and customer advances
   $ 199,950      $ 193,021