Note 12 - Changes to the Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
Balance	$ 833,751	$ 759,091
Balance	842,520	768,545
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(12,988)	(12,079)
Other comprehensive gain	810	(1,359)
Amounts reclassified from accumulated other comprehensive income		0
Balance	(12,178)	(13,438)
AOCI Attributable to Parent [Member]
Balance	(12,988)	(11,994)
Other comprehensive gain	810	(1,359)
Amounts reclassified from accumulated other comprehensive income		(85)
Balance	$ (12,178)	(13,438)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Balance		85
Other comprehensive gain		0
Amounts reclassified from accumulated other comprehensive income		(85)
Balance		$ 0