v3.26.1
CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Millions
Total
Total Shareholders' Equity Attributable to Amentum Holdings, Inc.
Common Stock
Additional Paid-in Capital
Retained Deficit
Accumulated Other Comprehensive Income
Non-controlling Interests
Beginning balance (in shares) at Sep. 27, 2024     243,000,000        
Beginning balance at Sep. 27, 2024 $ 4,552 $ 4,460 $ 2 $ 4,962 $ (527) $ 23 $ 92
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) including non-controlling interests 22 26     26   (4)
Other comprehensive income (loss), net of tax 20 20       20  
Measurement period adjustments 3 (63)   (63)     66
Distributions to non-controlling interests (21)           (21)
Stock-based compensation and other 13 15   15     (2)
Ending balance (in shares) at Jun. 27, 2025     243,000,000        
Ending balance at Jun. 27, 2025 4,589 4,458 $ 2 4,914 (501) 43 131
Beginning balance (in shares) at Mar. 28, 2025     243,000,000        
Beginning balance at Mar. 28, 2025 4,579 4,427 $ 2 4,907 (511) 29 152
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) including non-controlling interests (1) 10     10   (11)
Other comprehensive income (loss), net of tax 14 14       14  
Measurement period adjustments (9) 0   0     (9)
Distributions to non-controlling interests 1           1
Stock-based compensation and other 5 7   7     (2)
Ending balance (in shares) at Jun. 27, 2025     243,000,000        
Ending balance at Jun. 27, 2025 $ 4,589 4,458 $ 2 4,914 (501) 43 131
Beginning balance (in shares) at Oct. 03, 2025 243,464,776   243,000,000        
Beginning balance at Oct. 03, 2025 $ 4,620 4,505 $ 2 4,924 (461) 40 115
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) including non-controlling interests 164 164     164   0
Other comprehensive income (loss), net of tax 4 4       4  
Issuances of common stock (in shares)     1,000,000        
Distributions to non-controlling interests (23)           (23)
Stock-based compensation and other $ 24 22   22     2
Ending balance (in shares) at Jul. 03, 2026 244,319,846   244,000,000        
Ending balance at Jul. 03, 2026 $ 4,789 4,695 $ 2 4,946 (297) 44 94
Beginning balance (in shares) at Apr. 03, 2026     244,000,000        
Beginning balance at Apr. 03, 2026 4,703 4,609 $ 2 4,935 (363) 35 94
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) including non-controlling interests 66 66     66   0
Other comprehensive income (loss), net of tax 9 9       9  
Distributions to non-controlling interests (2)           (2)
Stock-based compensation and other $ 13 11   11     2
Ending balance (in shares) at Jul. 03, 2026 244,319,846   244,000,000        
Ending balance at Jul. 03, 2026 $ 4,789 $ 4,695 $ 2 $ 4,946 $ (297) $ 44 $ 94