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Note 12 - Changes to the Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 25, 2017
Mar. 31, 2018
Mar. 25, 2017
Beginning Balance     $ 682,322  
Ending Balance $ 722,182   722,182  
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Beginning Balance (13,228) $ (14,190) (9,341) $ (13,086)
Other comprehensive income (loss) before reclassifications 1,898 1,894 (1,989) 790
Amounts reclassified from accumulated other comprehensive income
Ending Balance (11,330) (12,296) (11,330) (12,296)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]        
Beginning Balance 356 (432) 466 (329)
Other comprehensive income (loss) before reclassifications (184) 598 (294) 495
Amounts reclassified from accumulated other comprehensive income
Ending Balance 172 166 172 166
AOCI Attributable to Parent [Member]        
Beginning Balance (12,872) (14,622) (8,875) (13,415)
Other comprehensive income (loss) before reclassifications 1,714 2,492 (2,283) 1,285
Amounts reclassified from accumulated other comprehensive income
Ending Balance $ (11,158) $ (12,130) $ (11,158) $ (12,130)