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Note P - Accumulated Other Comprehensive Loss - Changes to the Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 29, 2018
Balance	$ 833,751	$ 759,091	$ 682,322
Other comprehensive loss	(2,599)	(909)	(3,119)
Balance	809,498	833,751	759,091
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(12,988)	(12,079)
Other comprehensive loss	(2,599)
Other comprehensive loss before reclassifications		(909)
Amounts reclassified from accumulated other comprehensive income		0
Balance	(15,587)	(12,988)	(12,079)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Balance	0	85
Other comprehensive loss before reclassifications		0
Amounts reclassified from accumulated other comprehensive income		(85)
Balance		0	85
AOCI Attributable to Parent [Member]
Balance	(12,988)	(11,994)	(8,875)
Other comprehensive loss before reclassifications		(909)
Amounts reclassified from accumulated other comprehensive income		(85)
Balance	$ (15,587)	$ (12,988)	$ (11,994)

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- Definition

Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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