Financial Instruments, Long-term Debt (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 29, 2018	Sep. 23, 2017	Jun. 30, 2018	Jun. 24, 2017	Mar. 31, 2018	Dec. 28, 2013	Mar. 30, 2013
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 1,500,000		$ 1,500,000
Short-term Debt	(499,762)		(499,406)
Amortization of Debt Issuance Costs	(8,732)		(9,447)
Long-term debt, excluding current portion	991,506		991,147
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed				101.00%
Interest expense relating to the Notes	12,400	$ 12,600
Estimated fair value of long-term debt	1,461,000
Interest Expense	12,600	$ 12,600
Fixed Rate Note Due June 2027 at 3 Point 45 Percent [Member]
Debt Instrument [Line Items]
Long-term debt	500,000		500,000	$ 500,000
Fixed Rate Note Due November 2018 at 2 Point 50 Percent [Member]
Debt Instrument [Line Items]
Long-term debt	500,000		500,000			$ 500,000
Stated interest rate of the notes				2.50%	2.50%	2.50%
Effective interest rate of the Notes						2.60%
Net Proceeds From Issuance of Long Term Debt 4						$ 494,500
Fxed Rate Note Due March 2023 at 3 Point 375 Percent [Member]
Debt Instrument [Line Items]
Long-term debt	$ 500,000		$ 500,000				$ 500,000
Effective interest rate of the Notes							3.50%
proceeds from issuance of long term debt 3							$ 490,000
FixedRateNoteDueJune2027at3Point450Percent[Member] [Member]
Debt Instrument [Line Items]
Stated interest rate of the notes				3.45%	3.45%
Fixed Rate Note Due June 2027 at 3 Point 50 Percent [Member] [Domain]
Debt Instrument [Line Items]
Effective interest rate of the Notes				3.50%
Fixed Rate Note Due June 2027 at 3 Point 50 Percent [Member] [Member]
Debt Instrument [Line Items]
Net Proceeds From Issuance of Long Term Debt 5				$ 495,200
Fixed Rate Note Due March 2023 at 3 Point 375 Percent [Member]
Debt Instrument [Line Items]
Stated interest rate of the notes				3.375%	3.375%		3.375%