Note 8 - Employee Post-employment Benefits (Details Textual) $ in Thousands	12 Months Ended
	Jun. 06, 2017 USD ($)	May 31, 2016 USD ($)	Jun. 02, 2015 USD ($)
Defined Benefit Pension Plans	3
Employee-related Liabilities, Current	$ 15,505	$ 14,561
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost	3,600	2,100	$ 7,100
Deferred Compensation, Net	5,600	6,700
Prepaid Expense, Current	10,499	11,508
Other Assets, Noncurrent	41,508	45,751
Investment in RTI Common Stock and Related Liability Payable in RTI Common Stock	300	500
Severance Costs	$ 4,200	1,600
Defined Benefit Plan, Target Allocation, Percentage of Assets, Alternative Investments	16.00%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year	7.10%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%
Defined Benefit Plan Health Care Cost Trend Rate Assumed for Next Fiscal Year, Impact on Net Periodic Postretirement Benefit Expense, Percent	1.00%
Number of Defined Contribution Plans Sponsored By Entity	2
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	25.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%
Defined Contribution Plan, Cost	$ 300	300	0
Other Liabilities, Noncurrent	60,397	67,093
Related to Two Other Departures [Member]
Payments for Restructuring	100
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost	200
Severance Costs	800
Employee Severance [Member]
Employee-related Liabilities, Current	900	300
Severance Costs	5,807	1,006
Former Chairman, President, and Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost	900
Severance Costs	3,000
Former President and Chief Executive Officer [Member]
Deferred Compensation Arrangement with Individual, Allocated Share-based Compensation Expense, Forfeiture Credits		1,600
Former Executives [Member]
Severance Costs			$ 300
Pension Plan [Member]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	3,716
Cash Surrender Value of Life Insurance	25,400	27,900
Cash Held in Trust for Benefit Payments, Reclassified as Restricted Cash	1,400	400
Postretirement Medical and Life Benefits [Member]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	123
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	700
Deferred Compensation Plan [Member]
Prepaid Expense, Current	600	700
Other Assets, Noncurrent	5,000	6,000
Other Liabilities, Noncurrent	$ 5,000	$ 6,000
Equity Securities [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	56.00%
Fixed Income Securities [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	28.00%
Minimum [Member]
Primary Investment Objectives, Focus on Time Horizon	10 years
Minimum [Member] | Equity Securities [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	41.00%	41.00%
Minimum [Member] | Fixed Income Securities [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	13.00%	13.00%
Retirement Plan [Member]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 0
Executive Supplemental Pension Plan and Management Retirement Plan [Member]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 3,000