Debt and Credit Facility (Details 1) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 28, 2019	Dec. 29, 2018	Mar. 29, 2014	Mar. 30, 2019	May 30, 2017	Mar. 12, 2014
Debt Instrument [Line Items]
Net interest rate received (paid) from interest rate swap		$ 939,000	$ 923,000	$ 2,400,000
Debt Instrument, Description of Variable Rate Basis			three-month London Interbank Offered Rate (LIBOR) plus 91.43 bps
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, Excluding Current Maturities	1,246,000,000		1,246,000,000			$ 1,234,807,000
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%		2.95%
Debt Instrument, Unamortized Discount	$ (555,000)		$ (555,000)			(642,000)
Debt Issuance Costs, Noncurrent, Net	2,506,000		2,506,000			2,932,000
Long Term Debt, Carrying Value before Hedging Adjustment	746,939,000		746,939,000			746,426,000
Derivative, Amount of Hedged Item	0		0			(10,089,000)
Interest Expense, Debt, Excluding Amortization	5,444,000	6,470,000	17,429,000	19,026,000
Amortization of Debt Issuance Costs	142,000	142,000	426,000	426,000
Amortization of Debt Discount (Premium)	29,000	28,000	87,000	84,000
Interest Expense, Debt	$ 5,615,000	6,640,000	17,942,000	19,536,000
Proceeds from Issuance of Long-term Debt		745,200,000
Debt instrument, long term debt, remaining discount amortization period	4 years 6 months
Long-term Debt, Excluding Current Maturities	$ 746,939,000		746,939,000			736,337,000
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, Unamortized Discount	(654,000)		(654,000)			(1,063,000)
Debt Issuance Costs, Noncurrent, Net	285,000		285,000			467,000
Interest Expense, Debt, Excluding Amortization	3,750,000	3,750,000	11,250,000	11,250,000
Amortization of Debt Issuance Costs	61,000	61,000	182,000	183,000
Amortization of Debt Discount (Premium)	137,000	133,000	409,000	396,000
Interest Expense, Debt	$ 3,948,000	$ 3,944,000	11,841,000	$ 11,829,000
Proceeds from Issuance of Long-term Debt					$ 495,400,000
Debt instrument, long term debt, remaining discount amortization period	1 year 2 months 12 days
Long-term Debt, Excluding Current Maturities	$ 499,061,000		$ 499,061,000			$ 498,470,000