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Property and Equipment (Tables)
9 Months Ended
Sep. 26, 2020
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
Property and equipment are stated at cost. Depreciation is calculated using the straight-line method over estimated useful lives as follows:
Useful Lives
Aircraft and components
4 to 20 years
Buildings39 years
Building improvements
7 to 15 years
Computer equipment and software
2 to 12 years
Demonstration units3 years
Furniture and office equipment
2 to 6 years
Leasehold improvementsLesser of useful life or term of lease
Machinery and equipment
5 to 10 years
Tooling3 years
Vehicles5 years
Property and equipment, net, consists of the following (in thousands):
September 26,
2020
December 28,
2019
Building and building improvements$122,111 $101,731 
Machinery and equipment67,826 58,864 
Land56,103 40,216 
Aircraft and vehicles32,853 29,934 
Computer equipment and software23,906 19,650 
Leasehold improvements18,411 15,921 
Tooling18,038 15,346 
Furniture and office equipment13,288 11,049 
Demonstration units854 836 
Construction-in-progress (CIP)42,878 39,107 
     Total property and equipment396,268 332,654 
Accumulated depreciation(129,108)(113,102)
     Property and equipment, net$267,160 $219,552