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Stock Based Compensation	12 Months Ended
Stock Based Compensation	Sep. 27, 2024
Share-Based Payment Arrangement [Abstract]
Stock Based Compensation	Stock Based Compensation Amentum Joint Venture LP Class B units Prior to the Transaction, certain members of management were awarded Time-Vested Class B units and Performance-Vested Class B units in Amentum Joint Venture LP, our previous parent company (“AJVLP” and “Amentum Equityholder”). The Time-Vested Class B units vested 20% a year over five years and the Performance-Vested Class B units vested upon the consummation of a change in control transaction and achievement of certain return metrics associated with such transaction. Both the Time-Vested Class B units and Performance-Vested Class B units were equity classified awards in Amentum Joint Venture LP. The fair value of the Class B units was estimated based on the date of the grant using the Black-Scholes-Merton option-pricing model. We recognized compensation expense for the Time-Vested Class B units based on grant date fair values. Prior to the Transaction, compensation expense for the Time-Vested Class B units was recognized on a straight-line basis ratably over the requisite service period, which was the vesting period. In connection with the completion of the Transaction on September 27, 2024, the unvested Time-Vested and Performance-Vested Class B units were discretionarily modified to vest in connection with the Transaction. Due to the modification, we recognized $13 million of compensation expense in the consolidated statements of operations. As of September 27, 2024, there was no unrecognized compensation expense related to the Time-Vested Class B units or the Performance-Vested Class B units. Amounts recognized for forfeitures are adjusted periodically to reflect actual forfeitures. For the fiscal years ended September 27, 2024, September 29, 2023 and September 30, 2022, we recognized Class B unit compensation expense of $18 million, $3 million and $3 million, respectively. For the fiscal years ended September 27, 2024, September 29, 2023 and September 30, 2022, there were no income tax benefits recognized from Class B unit compensation expense. Conversion of Restricted Stock Units due to Transaction As part of the Transaction, 65,182 Jacobs’ restricted stock units were converted to 342,741 of Amentum time-based restricted stock units (“RSUs”). The fair value of the RSUs was determined based on the Company’s common stock on the Transaction date. The RSUs generally vest 50% a year over two years, 33% a year over three years, 25% a year over four years or cliff vest in three years. RSU compensation expense is recognized on a straight-line basis ratably over the requisite service period, which is generally the vesting period, unless otherwise specifically noted. No compensation expense was recognized for RSUs for the fiscal years ended September 27, 2024, September 29, 2023 and September 30, 2022. As of September 27, 2024, there was $5 million of unrecognized compensation expense related to the RSUs, scheduled to be recognized over a weighted-average period of 2.1 years.