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Pension and Other Postretirement Benefit Plans - Summary of Changes in the Fair Value of Plans' Level 3 Assets (Details) - Pension Plan - Non-U.S. Plans - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Oct. 01, 2021
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | $ 2,203,495 | $ 2,043,356
Effect of exchange rate changes | 304,160 | (89,051)
Fair value of plan assets at the end of the year | 1,297,625 | 2,203,495
Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | 482,057 |
Fair value of plan assets at the end of the year | 321,702 | 482,057
Real estate investments |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | 187,689 |
Fair value of plan assets at the end of the year | 143,903 | 187,689
Real estate investments | Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | 116,936 | 105,422
Purchases, sales, and settlements | (8,686) | 6,288
Realized and unrealized losses | 14,701 | 398
Acquisition of PA Consulting Plans, net of post-deal transfers |  | 0
Effect of exchange rate changes | (20,083) | 4,828
Fair value of plan assets at the end of the year | 102,868 | 116,936
Insurance contracts |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | 133,802 |
Fair value of plan assets at the end of the year | 80,231 | 133,802
Insurance contracts | Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | 133,802 | 67,709
Purchases, sales, and settlements | (6,312) | 2,413
Realized and unrealized losses | (24,770) | 1,448
Acquisition of PA Consulting Plans, net of post-deal transfers |  | 60,160
Effect of exchange rate changes | (22,489) | 2,072
Fair value of plan assets at the end of the year | 80,231 | 133,802
Hedge funds |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | 247,339 |
Fair value of plan assets at the end of the year | 150,171 | 247,339
Hedge funds | Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | 231,319 | 171,730
Purchases, sales, and settlements | (11,553) | 51,513
Realized and unrealized losses | (42,964) | 864
Acquisition of PA Consulting Plans, net of post-deal transfers |  | 0
Effect of exchange rate changes | (38,199) | 7,212
Fair value of plan assets at the end of the year | $ 138,603 | $ 231,319

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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