Note 8 - Employee Post-employment Benefits (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 11, 2016
Nov. 29, 2016
USD ($)
Dec. 01, 2015
USD ($)
Nov. 29, 2016
USD ($)
Dec. 01, 2015
USD ($)
May 31, 2016
USD ($)
Defined Benefit Pension Plans   3   3    
Number of Restaurants Closed 95     100    
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost   $ 1,600,000 $ 1,000,000 $ 2,500,000 $ 700,000  
Employee-related Liabilities, Current   16,194,000   16,194,000   $ 14,561,000
Closures and Impairments Expenses   15,708,000 12,072,000 45,900,000 14,784,000  
Employee Severance [Member]            
Severance Costs       4,910,000    
Employee-related Liabilities, Current   2,800,000   2,800,000   300,000
Closures and Impairments Expenses       3,300,000    
James J. Buettgen [Member]            
Severance Costs       3,000,000    
Payments for Postemployment Benefits   200,000        
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost   900,000        
Selling, General and Administrative Expenses [Member]            
Defined Benefit Plan, Amortization of Gains (Losses)   400,000 500,000 700,000 1,200,000  
Payroll and Related Costs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost       100,000    
Other Deferred Liabilities [Member]            
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost       0.20   200,000
Selling, General and Administrative Expense [Member] | Employee Severance [Member]            
Closures and Impairments Expenses       1,600,000    
Retirement Plan [Member]            
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year       100,000    
Pension Plan [Member]            
Defined Benefit Plan, Amortization of Gains (Losses)   (337,000) $ (473,000) (675,000) $ (1,101,000)  
Pension Plan [Member] | Payroll and Related Costs [Member]            
Defined Benefit Pension Plan Liabilities, Current   2,500,000   2,500,000   2,500,000
Pension Plan [Member] | Other Deferred Liabilities [Member]            
Defined Benefit Pension Plan, Liabilities, Noncurrent   34,600,000   34,600,000   35,700,000
Post-retirement Medical and Life Benefits Plans [Member] | Payroll and Related Costs [Member]            
Defined Benefit Pension Plan Liabilities, Current   100,000   100,000   100,000
Post-retirement Medical and Life Benefits Plans [Member] | Other Deferred Liabilities [Member]            
Defined Benefit Pension Plan, Liabilities, Noncurrent   $ 1,000,000   $ 1,000,000   $ 1,000,000