Postretirement Benefit Plans (Narrative) (Details)		3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 16, 2018 USD ($)	Dec. 29, 2018 USD ($)	Dec. 29, 2018 USD ($)	Mar. 30, 2019 USD ($)	Mar. 31, 2018 USD ($) participant	Mar. 25, 2017 USD ($)
Retirement Benefits [Abstract]
Number of pension plan participants authorized to terminate from Scheme | participant					60
Contribution paid	$ 11,000,000				$ 12,900,000
U.K. pension settlement			$ 13,800,000	$ 13,768,000	0	$ 0
Tax credit		$ 2,600,000
Funded status of Scheme at end of year				0	0
Employee matching contribution				$ 7,700,000	$ 6,700,000	$ 5,500,000