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Note 6 - Pension, Postretirement and Postemployment Defined Benefit Plans (Tables)
 9 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
PENSION PLANS
  
13 Weeks Ended
    
39 Weeks Ended
  
(Thousands of Dollars)
 
June 30, 2019
    
June 24, 2018
    
June 30, 2019
    
June 24, 2018
  
                                 
Service cost for benefits earned during the period
    
9
      
12
      
27
      
36
  
Interest cost on projected benefit obligation
    
1,641
      
1,438
      
4,923
      
4,314
  
Expected return on plan assets
    
(2,018
 )    
(1,983
 )    
(6,055
 )    
(5,949
 )
Amortization of net loss
    
284
      
506
      
851
      
1,518
  
Amortization of prior service benefit
    
(25
 )    
(34
 )    
(75
 )    
(102
 )
Pension benefit
    
(109
 )    
(61
 )    
(329
 )    
(183
 )
POSTRETIREMENT MEDICAL PLANS
  
13 Weeks Ended
    
39 Weeks Ended
  
(Thousands of Dollars)
 
June 30, 2019
    
June 24, 2018
    
June 30, 2019
    
June 24, 2018
  
                                 
Interest cost on projected benefit obligation
    
103
      
90
      
309
      
271
  
Expected return on plan assets
    
(270
 )    
(270
 )    
(811
 )    
(810
 )
Amortization of net gain
    
(244
 )    
(246
 )    
(732
 )    
(738
 )
Amortization of prior service benefit
    
(181
 )    
(196
 )    
(543
 )    
(588
 )
Curtailment gains
    
—
      
—
      
—
      
(2,031
 )
Postretirement medical benefit
    
(592
 )    
(622
 )    
(1,777
 )    
(3,896
 )