Commitments and Contingencies (Schedule Of Payments Due By Period) (Details) $ in Thousands	3 Months Ended
	Jun. 26, 2021 USD ($)
Commitments and Contingencies [Abstract]
Principal payments on long-term debt, Total	$ 198,000
Principal payments on long-term debt, 2 to 3 years	198,000
Finance lease commitments/financing obligations, Total	533,744	[1]
Finance lease commitments/financing obligations, Remainder of Year	58,034	[1]
Finance lease commitments/financing obligations, 2 to 3 Years	114,582	[1]
Finance lease commitments/financing obligations, 4 to 5 Years	103,894	[1]
Finance lease commitments/financing obligations, After 5 Years	257,234	[1]
Operating lease commitments, Total	266,783	[1]
Operating lease commitments, Within 1 year	39,184	[1]
Operating lease commitments, 2 to 3 years	71,021	[1]
Operating lease commitments, 4 to 5 years	58,413	[1]
Operating lease commitments, After 5 years	98,165	[1]
Accrued rent, Total	1,348
Accrued rent, Within 1 year	1,191
Accrued rent, 2 to 3 Years	87
Accrued rent, 4 to 5 Years	27
Accrued rent, After 5 Years	43
Other liabilities, Total	933
Other liabilities, Within 1 year	841
Other liabilities, 2 to 3 years	92
Other liabilities, 4 to 5 years
Other liabilities, After 5 years
Contractual commitments, Total	1,000,808
Contractual commitments, Within 1 year	99,250
Contractual commitments, 2 to 3 years	383,782
Contractual commitments, 4 to 5 years	162,334
Contractual commitments, After 5 years	355,442
Operating lease payments, related to options to extend, reasonably certain of being exercised	112,000
Finance lease payments, related to options to extend, reasonable certain of being exercised	$ 70,200

[1] Finance and operating lease commitments represent future undiscounted lease payments and include $112.0 million and $70.2 million, respectively, related to options to extend lease terms that are reasonably certain of being exercised.