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Note 7 - Pension, Postretirement and Postemployment Defined Benefit Plans (Tables)
 3 Months Ended
Dec. 29, 2019
Pension Plan [Member]  
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
PENSION PLANS
  
13 Weeks Ended
  
   
December 29,
    
December 30,
  
(Thousands of Dollars)
  
2019
    
2018
  
                 
Service cost for benefits earned during the period
    
8
      
9
  
Interest cost on projected benefit obligation
    
1,231
      
1,641
  
Expected return on plan assets
    
(1,951
 )    
(2,018
 )
Amortization of net loss
    
792
      
284
  
Amortization of prior service benefit
    
(2
 )    
(25
 )
Pension benefit
    
78
      
(109
 )
POSTRETIREMENT MEDICAL PLANS
  
13 Weeks Ended
  
   
December 29,
    
December 30,
  
(Thousands of Dollars)
  
2019
    
2018
  
                 
Interest cost on projected benefit obligation
    
67
      
103
  
Expected return on plan assets
    
(265
 )    
(270
 )
Amortization of net gain
    
(186
 )    
(244
 )
Amortization of prior service benefit
    
(161
 )    
(181
 )
Postretirement medical benefit
    
(545
 )    
(592
 )