Marketable Securities - Held to Maturity Securities (Details)	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017
Minimum [Member] | Short-term Marketable Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Remaining maturities on short-term and long-term marketable securities	1 month
Minimum [Member] | Long-term Marketable Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Remaining maturities on short-term and long-term marketable securities		13 months
Maximum [Member] | Short-term Marketable Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Remaining maturities on short-term and long-term marketable securities		12 months
Maximum [Member] | Long-term Marketable Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Remaining maturities on short-term and long-term marketable securities	34 months