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Leases - Schedule of Other Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 27, 2024 | Sep. 29, 2023 | Sep. 30, 2022
Cash paid for amounts included in the measurement of lease liabilities: |  |  |
Operating lease payments | $ 58 | $ 68 | $ 46
Operating lease right-of-use assets obtained in exchange for new operating lease liability | $ 4 | $ 1 | $ 5

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- Definition Cash Flow, Lessee [Abstract] + References No definition available. + Details
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Namespace Prefix: | amtm_
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Balance Type: | na
Period Type: | duration

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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration