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Note 7 - Pension, Postretirement and Postemployment Defined Benefit Plans (Tables)
 6 Months Ended
Mar. 29, 2020
Pension Plan [Member]  
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
PENSION PLANS
  
13 Weeks Ended
    
26 Weeks Ended
  
   
March 29,
    
March 31,
    
March 29,
    
March 31,
  
(Thousands of Dollars)
  
2020
    
2019
    
2020
    
2019
  
                         
Service cost for benefits earned during the period
  
103
    
9
    
111
    
18
  
Interest cost on projected benefit obligation
  
1,420
    
1,641
    
2,651
    
3,282
  
Expected return on plan assets
  
(2,321
 )  
(2,018
 )  
(4,272
 )  
(4,036
 )
Amortization of net loss
  
792
    
284
    
1584
    
568
  
Amortization of prior service benefit
  
(2
 )  
(25
 )  
(4
 )  
(50
 )
Pension benefit
  
(8
 )  
(109
 )  
70
    
(218
 )
POSTRETIREMENT MEDICAL PLANS
  
13 Weeks Ended
    
26 Weeks Ended
  
   
March 29,
    
March 31,
    
March 29,
    
March 31,
  
(Thousands of Dollars)
  
2020
    
2019
    
2020
    
2019
  
                         
Service cost for benefits earned during the period  
36
    
—
    
36
    
—
  
Interest cost on projected benefit obligation
  
110
    
103
    
177
    
206
  
Expected return on plan assets
  
(265
 )  
(270
 )  
(530
 )  
(540
 )
Amortization of net gain
  
(186
 )  
(244
 )  
(372
 )  
(488
 )
Amortization of prior service benefit
  
(161
 )  
(181
 )  
(322
 )  
(362
 )
Postretirement medical benefit
  
(466
 )  
(592
 )  
(1,011
 )  
(1,184
 )