Fair Value Measurements (Schedule Of Fair Value And Carrying Value Of Borrowings Under Long-Term Debt) (Details) - USD ($) $ in Thousands	Feb. 29, 2020	Jun. 01, 2019
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 908	$ 2,554
Carrying Value | Note payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	0	1,500
Carrying Value | Finance lease obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	908	1,054
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	823	2,441
Fair Value | Note payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	0	1,501
Fair Value | Finance lease obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 823	$ 940