Note 5 - Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($)	12 Months Ended
	Sep. 27, 2020	Sep. 29, 2019
Goodwill, gross amount	$ 1,539,038,000	$ 1,534,905,000
Accumulated impairment losses	(1,288,729,000)	(1,288,729,000)
Goodwill	250,309,000	246,176,000
Goodwill acquired in business combinations	78,136,000	4,133,000
Goodwill	$ 328,445,000	$ 250,309,000