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Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Oct. 03, 2020 | Sep. 28, 2019 | Sep. 29, 2018
Contract Reserves |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | $ 60,914 | $ 48,818 | $ 46,314
Additions charged to cost and expenses | 76,747 | 45,464 | 36,830
Deductions | 66,885 | 35,714 | 34,241
Foreign exchange impact and other | 1,636 | 2,346 | (85)
Balance at end of year | 72,412 | 60,914 | 48,818
Allowance for Doubtful Accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 5,402 | 4,959 | 4,351
Additions charged to cost and expenses | 3,774 | 1,522 | 2,213
Deductions | 3,144 | 891 | 1,468
Foreign exchange impact and other | 281 | (188) | (137)
Balance at end of year | 6,313 | 5,402 | 4,959
Reserve for Inventory Valuation |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 134,185 | 125,316 | 108,539
Additions charged to cost and expenses | 52,956 | 23,227 | 33,569
Deductions | 35,747 | 12,716 | 15,540
Foreign exchange impact and other | 1,917 | (1,642) | (1,252)
Balance at end of year | 153,311 | 134,185 | 125,316
Deferred Tax Valuation Allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 13,137 | 15,181 | 4,776
Additions charged to cost and expenses | 2,003 | 274 | 10,499
Deductions | 860 | 1,808 | 101
Foreign exchange impact and other | 504 | (510) | 7
Balance at end of year | $ 14,784 | $ 13,137 | $ 15,181

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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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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