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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 28, 2019
Postemployment and Postretirement Benefit Plans [Line Items]
Accrued liability for cash bonuses	$ 22,000	$ 22,300
Investment Profit Sharing Plan [Member]
Postemployment and Postretirement Benefit Plans [Line Items]
Operating and administrative expenses	5,100	4,200	$ 2,900
Nonqualified Investment Plan [Member]
Postemployment and Postretirement Benefit Plans [Line Items]
Operating and administrative expenses	375	294	224
Cash Bonuses [Member]
Postemployment and Postretirement Benefit Plans [Line Items]
Operating and administrative expenses	$ 27,200	35,900	$ 11,900
Cash Bonuses [Member] | COVID-19 Pandemic [Member]
Postemployment and Postretirement Benefit Plans [Line Items]
Operating and administrative expenses		$ 15,000

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- References

No definition available.

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- Definition

Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6935-107765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6911-107765

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

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