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Segment Reporting (Tables)
9 Months Ended
Sep. 26, 2021
Segment Reporting [Abstract]  
Information by Reportable Segment The following table shows information by reportable segment for the periods presented (in thousands):
Three Months EndedNine Months Ended
September 26,September 27,September 26,September 27,
2021202020212020
Revenues
GMS$448,078 $521,346 $1,480,982 $1,486,643 
NSS241,436 144,894 704,297 440,152 
Corporate— — — — 
Total revenues$689,514 $666,240 $2,185,279 $1,926,795 
Operating income (loss)
GMS$20,459 $31,401 $73,673 $75,541 
NSS13,091 5,679 33,729 17,770 
Corporate(7,514)(8,548)(24,409)(23,027)
Total operating income$26,036 $28,532 $82,993 $70,284 
Amortization of intangible assets
GMS$4,161 $4,115 $12,483 $12,346 
NSS8,469 3,932 24,993 11,795 
Corporate— — — 
Total amortization of intangible assets$12,630 $8,047 $37,476 $24,141