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Commitments	12 Months Ended
Commitments	Dec. 29, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments	Commitments The Company has outstanding letters of credit of $93 million as of December 29, 2017, principally related to performance guarantees on contracts. The Company also has outstanding surety bonds in the amount of $148 million as of December 29, 2017, principally related to performance and subcontractor payment bonds on the Company's contracts. The outstanding letters of credit and surety bonds have various terms with the majority expiring over the next four fiscal years.