Divestitures (Summary Of Components Of Income From Discontinued Operations Before Income Taxes) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019	Sep. 30, 2019
GBL
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss (Gain) on sale	$ 200,000		$ (3,600,000)		$ (989,800,000)
Write-down of assets of business held for sale to fair value less cost to sell		$ 0
GAC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Write-down of assets of business held for sale to fair value less cost to sell				$ 110,000,000.0
Discontinued Operations, Held-For-Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations before income taxes	(200,000)	(4,900,000)	3,600,000	861,000,000.0
Discontinued Operations, Held-For-Sale | GBL
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales		0		249,000,000.0
Cost of goods sold		0		164,600,000
Gross profit		0		84,400,000
Operating expenses		0		57,000,000.0
Operating income (loss)		0		27,400,000
Interest expense		0		23,300,000
Other non-operating expense, net		0		500,000
Loss (Gain) on sale		5,700,000		(990,600,000)
Reclassification of accumulated other comprehensive income		0		18,500,000
(Loss) income from discontinued operations before income taxes	(200,000)	(5,700,000)	3,600,000	975,700,000
Discontinued Operations, Held-For-Sale | GAC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales		0		87,700,000
Cost of goods sold		0		52,500,000
Gross profit		0		35,200,000
Operating expenses		0		35,700,000
Operating income (loss)		0		(500,000)
Interest expense		0		700,000
Other non-operating expense, net		0		200,000
Write-down of assets of business held for sale to fair value less cost to sell		(800,000)		110,000,000.0
Reclassification of accumulated other comprehensive income		0		3,300,000
(Loss) income from discontinued operations before income taxes	$ 0	$ 800,000	$ 0	$ (114,700,000)