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Goodwill and Intangibles - Schedule of Carrying Value of Goodwill by Reportable Segment Appearing in Accompanying Consolidated Balance Sheets (Details) $ in Thousands | 9 Months Ended
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Jul. 02, 2021 USD ($)
Goodwill [Roll Forward] |
Balance at the beginning of the period | $ 5,639,091
Acquired | 1,573,015
Foreign Exchange Impact | 18,552
Post-Acquisition Adjustments | 1,612
Balance at the end of the period | 7,232,270
Critical Mission Solutions |
Goodwill [Roll Forward] |
Balance at the beginning of the period | 2,409,081
Acquired | 130,691
Foreign Exchange Impact | 13,592
Post-Acquisition Adjustments | 1,612
Balance at the end of the period | 2,554,976
People & Places Solutions |
Goodwill [Roll Forward] |
Balance at the beginning of the period | 3,230,010
Acquired | 0
Foreign Exchange Impact | 15,672
Post-Acquisition Adjustments | 0
Balance at the end of the period | 3,245,682
PA Consulting |
Goodwill [Roll Forward] |
Balance at the beginning of the period | 0
Acquired | 1,442,324
Foreign Exchange Impact | (10,712)
Post-Acquisition Adjustments | 0
Balance at the end of the period | $ 1,431,612

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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