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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 26, 2020 | Sep. 28, 2019 | Sep. 29, 2018
Allowance for Doubtful Accounts [Member] |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at Beginning of Period |  | $ 2,573 | $ 3,629 | $ 3,044
Charged (credited) to Costs and Expenses |  | 3,855 | 2,580 | 4,443
Other Additions |  | 0 | 0 | 0
Deductions | [1] | (1,955) | (3,636) | (3,858)
Balance at End of Period |  | 4,473 | 2,573 | 3,629
Valuation Allowance of Deferred Tax Assets [Member] |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at Beginning of Period |  | 37,996 | 37,881 | 59,188
Charged (credited) to Costs and Expenses |  | (298) | 115 | (1,366)
Other Additions |  | 0 | 0 | 0
Deductions | [1] | 0 | 0 | (19,941)
Balance at End of Period |  | $ 37,698 | $ 37,996 | $ 37,881
[1] | Represents amounts that did not impact earnings.

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column D)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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