Investments in Associated Companies - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 24, 2023	Sep. 25, 2022	Sep. 26, 2021
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 27,819	$ 27,378
Goodwill	329,504	329,504	$ 330,204
Editorial service costs	323,067	344,905	325,597
TNI Partners
Schedule of Equity Method Investments [Line Items]
Distributions from equity method investments	$ 3,600	3,800	5,200
Equity method investments, ownership percentage	50.00%
Equity method investments	$ 15,100	15,300
Goodwill	12,400
Other intangible assets	2,300
TNI Partners | Editorial Services
Schedule of Equity Method Investments [Line Items]
Editorial service costs	4,400	5,200	4,500
MNI
Schedule of Equity Method Investments [Line Items]
Distributions from equity method investments	$ 2,200	1,300	2,300
Equity method investments, ownership percentage	50.00%
Equity method investments	$ 12,800	12,000
Editorial service fees	$ 5,400	$ 5,600	$ 5,600