Note 8 - Employee Post-employment Benefits (Details Textual) $ in Thousands	3 Months Ended
	Sep. 05, 2017 USD ($)	Aug. 30, 2016 USD ($)	Jun. 06, 2017 USD ($)
Defined Benefit Pension Plans	3
Number of Defined Contribution Plans Sponsored By Entity			2
Employee-related Liabilities, Current	$ 12,413		$ 15,505
Employee Severance [Member]
Employee-related Liabilities, Current			900
Selling, General and Administrative Expenses [Member]
Defined Benefit Plan, Amortization of Gain (Loss)	100	$ 400
Retirement Plan [Member]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year			0
Executive Supplemental Pension Plan and Management Retirement Plan [Member] | Payroll and Related Costs [Member]
Liability, Defined Benefit Pension Plan, Current	1,600		3,000
Executive Supplemental Pension Plan and Management Retirement Plan [Member] | Other Deferred Liabilities [Member]
Liability, Defined Benefit Pension Plan, Noncurrent	33,900		33,500
Post-retirement Medical and Life Benefits Plans [Member] | Payroll and Related Costs [Member]
Liability, Defined Benefit Pension Plan, Current	100		100
Post-retirement Medical and Life Benefits Plans [Member] | Other Deferred Liabilities [Member]
Liability, Defined Benefit Pension Plan, Noncurrent	900		$ 900
Executive Supplemental Pension Plan [Member]
Defined Benefit Plan, Benefit Obligation, Payment for Settlement	$ 1,400