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Segment Information (Tables)

12 Months Ended

Oct. 03, 2025

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The following table presents segment information provided to the CODM and reconciles segment Adjusted EBITDA to net income (loss) attributable to common shareholders, with prior year performance measures recast to reflect the current reportable segment structure:

			For the years ended
			October 3, 2025																		September 27, 2024																		September 29, 2023
(Amounts in millions)			DS						GES						Total						DS						GES						Total						DS						GES						Total
Revenues			$	5,543					$	8,850					$	14,393					$	1,981					$	6,407					$	8,388					$	1,899					$	5,966					$	7,865
Cost of revenues			(4,924)						(7,956)						(12,880)						(1,761)						(5,829)						(7,590)						(1,659)						(5,424)						(7,083)
Other segment expenses (1)			(182)						(227)						(409)						(61)						(119)						(180)						(81)						(105)						(186)
Adjusted EBITDA attributable to Amentum Holdings, Inc.			$	437					$	667					$	1,104					$	159					$	459					$	618					$	159					$	437					$	596
Depreciation expense															(40)																		(23)																		(27)
Amortization of intangibles															(479)																		(228)																		(298)
Interest expense and other, net															(353)																		(438)																		(397)
Non-controlling interests															(7)																		(1)																		(7)
Acquisition, transaction and integration costs (2)															(85)																		(62)																		(39)
Non-cash GAAP expense (gain) (3)															—																		69																		(186)
Loss on extinguishment of debt (4)															(12)																		(45)																		—
Utilization of fair market value adjustments (5)															8																		5																		21
Stock-based compensation (6)															(21)																		(18)																		(3)
Income (loss) before income taxes															115																		(123)																		(340)
Provision for income taxes															(56)																		40																		19
Net income (loss) including non-controlling interests															59																		(83)																		(321)
Net income (loss) attributable to non-controlling interests															7																		1																		7
Net income (loss) attributable to common shareholders															$	66																	$	(82)																	$	(314)

(1)    Represents the difference between segment revenues, costs of revenues, and Adjusted EBITDA attributable to Amentum Holdings, Inc. Other segment expenses primarily includes selling, general, and administrative expenses, and equity earnings of non-consolidated subsidiaries and excludes certain discrete items that are not considered in the evaluation of ongoing performance.

(2)    Represents acquisition, transaction and integration costs, including severance, retention, and other adjustments related to acquisition and integration activities.

(3)    Represents a non-cash goodwill impairment charge and a non-cash gain on acquisition of controlling interest.

(4)    Represents the write-off of debt discount and debt issuance costs as a result of debt modifications.

(5)    Represents the periodic utilization of the fair market value adjustments assigned to certain equity method investments and non-controlling interests based on the remaining period of performance for the related contract.

(6)    Represents non-cash compensation expenses recognized for stock-based arrangements.

X

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 25
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-25

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-30

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- References

No definition available.

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