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SIGNIFICANT ACCOUNTING POLICIES - Estimated Useful Lives of Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 29, 2024	Sep. 24, 2023	Sep. 25, 2022
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 10.4	$ 11.6	$ 14.4
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (years)	5 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (years)	40 years
Printing presses and insertion equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (years)	5 years
Printing presses and insertion equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (years)	25 years
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (years)	3 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (years)	10 years
Other | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (years)	3 years
Other | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (years)	15 years

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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