Restructuring and Impairment Charges Schedule of Restructuring Accrual Activity (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Apr. 04, 2020	Sep. 28, 2019	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve		$ 1,297	$ 36	$ 1,297	$ 0
Restructuring and impairment charges	$ 6,000	1,700	6,003	1,678	0
Amounts utilized			(7,264)	(381)
Fixed Asset and Operating Right-of-Use Asset Impairment
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve		0	0	0	0
Restructuring and impairment charges			3,054	0
Amounts utilized			(3,054)	0
Employee Termination and Severance Costs
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve		$ 1,297	36	1,297	$ 0
Restructuring and impairment charges			2,949	1,678
Amounts utilized			$ (4,210)	$ (381)

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

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