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Revenues - Schedule of Changes in Estimated Contract Earnings (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 30, 2022
Revenue from Contract with Customer [Abstract]
Favorable earnings at completion adjustments	$ 83	$ 88	$ 75
Unfavorable earnings at completion adjustments	(38)	(46)	(27)
Net favorable adjustments	$ 45	$ 42	$ 48
Impact on diluted loss per share attributable to common shareholders (USD per share)	$ 0.40	$ 0.37	$ 0.42

X

- Definition

Contract With Customer Asset, Cumulative Catch Up Adjustment To Revenue, Favorable Adjustment

+ References

No definition available.

+ Details

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X

- Definition

Contract With Customer Asset, Cumulative Catch Up Adjustment To Revenue, UnFavorable Adjustment

+ References

No definition available.

+ Details

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X

- Definition

Contract With Customer, Asset, Effect On Diluted Earnings (Loss) Per Share

+ References

No definition available.

+ Details

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Namespace Prefix:	amtm_
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- Definition

Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in estimate of transaction price which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. Includes, but is not limited to, change in assessment of whether estimate of variable consideration is constrained.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-10

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- References

No definition available.

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