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General (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Nov. 26, 2015	Nov. 27, 2014	Nov. 26, 2015	Nov. 27, 2014	May. 28, 2015
General [Line Items]
Depreciation	$ 10,188,000	$ 10,048,000	$ 20,516,000	$ 19,008,000
Percentage Of Cash Dividends			110.00%
Restricted Cash and Investments, Total	8,736,000		$ 8,736,000
Fair Value, Inputs, Level 1 [Member]
General [Line Items]
Available-for-sale Securities, Fair Value Disclosure	70,000		70,000		$ 70,000
Fair Value, Inputs, Level 2 [Member]
General [Line Items]
Interest Rate Fair Value Hedge Liability at Fair Value	$ 33,000		$ 33,000		28,000
Fair Value, Inputs, Level 3 [Member]
General [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance					$ 7,737,000

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value as of the balance sheet date of all derivative liabilities designated as interest rate fair value hedging instruments.

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Cash and investments whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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