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Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Contract Loss Reserve |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | $ 48,818 | $ 46,314 | $ 36,793
Additions charged to cost and expenses | 45,464 | 36,830 | 43,874
Deductions | 35,714 | 34,241 | 34,384
Foreign exchange impact and other | 2,346 | (85) | 31
Balance at end of year | 60,914 | 48,818 | 46,314
Allowance for Doubtful Accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 4,959 | 4,351 | 4,538
Additions charged to cost and expenses | 1,522 | 2,213 | 1,291
Deductions | 891 | 1,468 | 1,786
Foreign exchange impact and other | (188) | (137) | 308
Balance at end of year | 5,402 | 4,959 | 4,351
Inventory Valuation Reserve |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 125,316 | 108,539 | 109,192
Additions charged to cost and expenses | 23,227 | 33,569 | 12,661
Deductions | 12,716 | 15,540 | 14,019
Foreign exchange impact and other | (1,642) | (1,252) | 705
Balance at end of year | 134,185 | 125,316 | 108,539
Valuation Allowance of Deferred Tax Assets |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | 15,181 | 4,776 | 10,938
Additions charged to cost and expenses | 274 | 10,499 | 895
Deductions | 1,808 | 101 | 7,172
Foreign exchange impact and other | (510) | 7 | 115
Balance at end of year | $ 13,137 | $ 15,181 | $ 4,776

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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=26873400&loc=d3e24092-122690 + Details
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