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Commitments And Contingencies (Narrative) (Details)	12 Months Ended
	May 25, 2019 USD ($) ft²	May 26, 2018 USD ($)	May 27, 2017 USD ($)
Property Subject to or Available for Operating Lease [Line Items]
Capital leases	$ 0
Rent expense	$ 15,500,000	$ 13,700,000	$ 12,900,000
Area of real estate property | ft²	57,000
Rental income	$ 240,000	$ 305,000	$ 332,000
Expected rental income from third party leases in 2020	414,000
Expected rental income from third party leases in 2021	368,000
Expected rental income from third party leases in 2022	306,000
Expected rental income from third party leases in 2023	226,000
Expected rental income from third party leases in 2024	232,000
Expected rental income from third party leases after 2024	$ 78,000
Leases To Independent Third Parties [Member]
Property Subject to or Available for Operating Lease [Line Items]
Area of real estate property | ft²	13,000

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