Commitments And Contingencies (Schedule Of Contractual Obligations And Commitments) (Details) $ in Thousands	Mar. 26, 2021 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remainder of Fiscal 2018	$ 1,979
Naming rights, Fiscal 2019	8,015
Naming rights, Fiscal 2020	8,116
Naming rights, Fiscal 2021	8,219
Naming rights, Fiscal 2022	8,322
Naming rights, Thereafter	61,277
Naming rights, Total	95,928
Purchase obligation, Remainder of 2018	8,838
Purchase obligation, Fiscal 2019	5,169
Purchase obligation, Fiscal 2020	1,566
Purchase Obligation, Fiscal 2021	979
Purchase obligation, Fiscal 2022	0
Purchase obligation, Thereafter	0
Purchase obligation, Total	16,552
Donation commitments, Remainder of Fiscal 2018	2,052
Donation commitments, Fiscal 2019	1,740
Donation commitments, Fiscal 2020	44
Donation commitments, Fiscal 2021	44
Donation commitments, Fiscal 2022	44
Donation commitments, Thereafter	114
Donation commitments, Total	4,038
Total, due in Remainder of Fiscal 2018	12,869
Total, due in Fiscal 2019	14,924
Total, due in Fiscal 2020	9,726
Total, due in Fiscal 2021	9,242
Total, due in Fiscal 2022	8,366
Total, due Thereafter	61,391
Total due	$ 116,518