Note 4 - Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($)	1 Months Ended	12 Months Ended
	Feb. 28, 2019	Sep. 29, 2019	Sep. 30, 2018
Goodwill, gross amount		$ 1,534,905,000	$ 1,535,155,000
Accumulated impairment losses		(1,288,729,000)	(1,288,729,000)
Goodwill		246,176,000	246,426,000
Goodwill acquired in business combinations	$ 3,433,000	4,133,000
Goodwill allocated to disposed businesses			(250,000)
Goodwill		$ 250,309,000	$ 246,176,000