Summary of Significant Accounting Policies (Intangibles) (Details)	12 Months Ended
	Jan. 03, 2020
Program and contract intangibles | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets (in years)	6 years
Program and contract intangibles | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets (in years)	11 years
Software and technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets (in years)	4 years
Software and technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets (in years)	15 years
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets (in years)	8 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets (in years)	10 years
Trade names
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets (in years)	3 years