Debt and Credit Facility (Details 1) - USD ($)				3 Months Ended		6 Months Ended
	May 19, 2020	May 30, 2017	Mar. 12, 2014	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019	Mar. 28, 2020
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt, net						$ 744,427,000	$ 0
Line of Credit Facility, Maximum Borrowing Capacity				$ 400,000,000.0		400,000,000.0
AdditionalborrowingcapacityfromRevolvingCreditFacility				150,000,000.0		150,000,000.0
Line of Credit Facility, Average Outstanding Amount				0
Long-term debt				1,492,066,000		1,492,066,000		$ 747,110,000
Two Point and Nine Five Percent 2024 Senior Debentures [Member]
Debt Instrument [Line Items]
Discount Percent of Par		99.887%
Debt Instrument, Face Amount				750,000,000		750,000,000		750,000,000
Debt Instrument, Interest Rate, Stated Percentage		2.95%
Debt Instrument, Unamortized Discount				(466,000)		(466,000)		(525,000)
Debt Issuance Costs, Noncurrent, Net				2,081,000		2,081,000		2,365,000
Long Term Debt, Carrying Value before Hedging Adjustment				747,453,000		747,453,000		747,110,000
Interest Expense, Debt, Excluding Amortization				5,444,000	$ 5,444,000	10,887,000	11,986,000
Amortization of Debt Issuance Costs				142,000	142,000	284,000	284,000
Amortization of Debt Discount (Premium)				30,000	29,000	59,000	58,000
Interest Expense, Debt				$ 5,616,000	5,615,000	11,230,000	12,328,000
Proceeds from issuance of long-term debt, net		$ 745,200,000
Debt instrument, long term debt, remaining discount amortization period				3 years 8 months 12 days
Long-term debt								1,492,066,000
Debt Instrument, Interest Rate, Effective Percentage		2.968%
Two Point and Three Seven Five Percent 2030 Senior Debentures [Member]
Debt Instrument [Line Items]
Discount Percent of Par	99.973%
Debt Instrument, Face Amount				$ 750,000,000		750,000,000
Debt Instrument, Interest Rate, Stated Percentage	2.375%
Debt Instrument, Unamortized Discount				(196,000)		(196,000)
Debt Issuance Costs, Noncurrent, Net				5,191,000		5,191,000
Long Term Debt, Carrying Value before Hedging Adjustment				744,613,000		744,613,000
Interest Expense, Debt, Excluding Amortization				4,521,000	0	6,565,000	0
Amortization of Debt Issuance Costs				134,000	0	179,000	0
Amortization of Debt Discount (Premium)				4,000	0	7,000	0
Interest Expense, Debt				$ 4,659,000	0	6,751,000	0
Proceeds from issuance of long-term debt, net	$ 744,400,000
Debt instrument, long term debt, remaining discount amortization period				9 years 8 months 12 days
Debt Instrument, Interest Rate, Effective Percentage	2.378%
Three Point Zero Percent 2021 Senior Debentures [Member]
Debt Instrument [Line Items]
Discount Percent of Par			99.281%
Debt Instrument, Face Amount				$ 500,000,000		500,000,000		500,000,000
Debt Instrument, Interest Rate, Stated Percentage			3.00%
Debt Instrument, Unamortized Discount				(236,000)		(236,000)		(517,000)
Debt Issuance Costs, Noncurrent, Net				102,000		102,000		223,000
Interest Expense, Debt, Excluding Amortization				3,750,000	3,750,000	7,500,000	7,500,000
Amortization of Debt Issuance Costs				61,000	61,000	121,000	122,000
Amortization of Debt Discount (Premium)				140,000	136,000	281,000	271,000
Interest Expense, Debt				$ 3,951,000	$ 3,947,000	7,902,000	$ 7,893,000
Proceeds from issuance of long-term debt, net			$ 495,400,000
Debt instrument, long term debt, remaining discount amortization period				6 months
Long-term debt				$ 499,662,000		$ 499,662,000		$ 499,260,000
Debt Instrument, Interest Rate, Effective Percentage			3.115%