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Segment Reporting (Tables)
3 Months Ended
Mar. 28, 2021
Segment Reporting [Abstract]  
Information by Reportable Segment The following table shows information by reportable segment for the periods presented (in thousands):
Three Months Ended
March 28,March 29,
20212020
Revenues
GMS$521,561 $457,444 
NSS227,006 159,809 
Corporate— — 
Total revenues$748,567 $617,253 
Operating income (loss)
GMS$24,514 $12,603 
NSS11,390 4,367 
Corporate(9,708)(9,513)
Total operating income$26,196 $7,457 
Amortization of intangible assets
GMS$4,161 $4,115 
NSS8,054 3,932 
Corporate— — 
Total amortization of intangible assets$12,215 $8,047