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Note 12 (Tables)
 9 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Three Months Ended June 30, 2018
            
Nine Months Ended June 30, 2018
          
   
(unaudited)
            
(unaudited)
          
   
(in thousands)
            
(in thousands)
          
                                                 
     
 
    
Unrealized
      
 
      
 
    
Unrealized
      
 
  
   
Foreign Currency
    
Holding Gain (Loss)
      
 
    
Foreign Currency
    
Holding Gain (Loss)
      
 
  
   
Translation
    
on Marketable
      
 
    
Translation
    
on Marketable
      
 
  
   
Adjustments
    
Securities
    
Total
    
Adjustments
    
Securities
    
Total
  
                                                 
Beginning Balance
   $
(11,330
 )   $
172
     $
(11,158
 )   $
(9,341
 )   $
466
     $
(8,875
 )
                                                 
Other comprehensive loss before reclassifications
    
(2,359
 )    
(328
 )    
(2,687
 )    
(4,348
 )    
(622
 )    
(4,970
 )
                                                 
Amounts reclassified from accumulated other comprehensive income
    
-
      
75
      
75
      
-
      
75
      
75
  
                                                 
Ending Balance
   $
(13,689
 )   $
(81
 )   $
(13,770
 )   $
(13,689
 )   $
(81
 )   $
(13,770
 )
   
Three Months Ended June 24, 2017
            
Nine Months Ended June 24, 2017
          
   
(unaudited)
            
(unaudited)
          
   
(in thousands)
            
(in thousands)
          
                                                 
     
 
      
 
      
 
      
 
    
Unrealized
      
 
  
     
 
    
Unrealized
      
 
      
 
    
Holding
      
 
  
   
Foreign Currency
    
Holding Gain on
      
 
    
Foreign Currency
    
Loss (Gain) on
      
 
  
   
Translation
    
Marketable
      
 
    
Translation
    
Marketable
      
 
  
   
Adjustments
    
Securities
    
Total
    
Adjustments
    
Securities
    
Total
  
                                                 
Beginning Balance
   $
(12,296
 )   $
166
     $
(12,130
 )   $
(13,086
 )   $
(329
 )   $
(13,415
 )
                                                 
Other comprehensive income before reclassifications
    
1,095
      
204
      
1,299
      
1,885
      
699
      
2,584
  
                                                 
Amounts reclassified from accumulated other comprehensive income
    
-
      
-
      
-
      
-
      
 
      
-
  
                                                 
Ending Balance
   $
(11,201
 )   $
370
     $
(10,831
 )   $
(11,201
 )   $
370
     $
(10,831
 )