Retirement Plans - Schedule of Future Cash Flows (Details) $ in Thousands	9 Months Ended
Jul. 05, 2020 USD ($)
SERP
Defined Benefit Plan Disclosure [Line Items]
Net year-to-date contributions	$ 4,070
Remaining estimated net contributions during fiscal 2020	1,301
Postretirement Healthcare Plans
Defined Benefit Plan Disclosure [Line Items]
Net year-to-date contributions	851
Remaining estimated net contributions during fiscal 2020	$ 550

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration