Significant Accounting Policies - Property and Equipment and Long-Lived Assets (Details)	12 Months Ended
	Dec. 28, 2019
Leases
Operating lease right-of-use assets, Statement of Financial Position	us-gaap:OtherAssetsNoncurrent
Operating lease liabilities, Statement of Financial Position	us-gaap:OtherLiabilitiesCurrent us-gaap:LiabilitiesOtherThanLongtermDebtNoncurrent
Low end of range
Property and Equipment
Useful life	3 years
Long-Lived Assets
Useful life of purchased intangible assets	4 years
High end of range
Property and Equipment
Useful life	15 years
Long-Lived Assets
Useful life of purchased intangible assets	12 years
Buildings
Property and Equipment
Useful life	40 years
Leasehold interest in ground leases
Property and Equipment
Useful life	86 years