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v3.23.3

Income Taxes - Deferred tax (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Deferred tax assets: |  |  |
Compensation and benefit accruals not currently deductible | $ 92.2 | $ 91.6 |
Net operating loss carryforwards | 102.3 | 113.7 |
Self-insurance reserves | 23.2 | 4.5 |
Research and experimentation and other tax credits | 43.1 | 111.4 |
Pension liability | 44.7 | 52.1 |
Accrued liabilities | 295.1 | 280.4 |
Capital loss carryforward | 64.0 | 64.4 |
Partnership investment | 102.0 |  |
Other | 7.1 | 5.3 |
Total deferred tax assets | 773.7 | 723.4 |
Deferred tax liabilities: |  |  |
Unearned revenue | (7.0) | (1.5) |
Depreciation and amortization | (13.1) | (111.4) |
Acquired intangible assets | (5.4) | (11.2) |
Investment in subsidiaries | (10.7) | (10.8) |
Right of use assets | (94.0) | (125.6) |
Contingent consideration | (34.2) | (33.6) |
Other | (15.5) |  |
Total deferred tax liabilities | (179.9) | (294.1) |
Valuation allowance | (171.2) | (154.4) |
Net deferred tax assets | 422.6 | 274.9 |
Income Taxes, additional disclosures |  |  |
Capital loss carryforwards | 199.4 | 205.2 |
Remaining gross tax asset exclusive of tax liabilities realized | 602.5 |  |
Valuation allowance related to the AECOM Capital impairment charge | 21.0 |  |
Increase in valuation allowance | 16.8 |  |
Decrease in valuation allowance related to capital losses | 3.3 |  |
Increase in valuation allowance related to state net operating losses and credits | 0.9 |  |
Gross book-tax differences from non-U.S. subsidiaries | 1,300.0 |  |
Liability for unrecognized tax benefits, including potential interest and penalties, net of related tax benefit | 79.5 | 70.5 |
Unrecognized tax benefits | 62.1 | 55.2 | $ 46.4
Unrecognized tax benefits that would be included in the effective tax rate if recognized | 60.7 |  |
Other Credits |  |  |
Income Taxes, additional disclosures |  |  |
Unused tax credits | 10.4 |  |
Federal |  |  |
Income Taxes, additional disclosures |  |  |
Net operating loss carryforwards | 757.5 | 848.0 |
Liability for unrecognized tax benefits, including potential interest and penalties, net of related tax benefit | 62.1 | 55.2 |
State |  |  |
Income Taxes, additional disclosures |  |  |
Net operating loss carryforwards | 757.5 | $ 848.0 |
State | Research and development |  |  |
Income Taxes, additional disclosures |  |  |
Unused tax credits | 27.2 |  |
Foreign Tax Authority [Member] |  |  |
Income Taxes, additional disclosures |  |  |
Net operating loss carryforwards | 757.5 |  |
Foreign Tax Authority [Member] | Research and development |  |  |
Income Taxes, additional disclosures |  |  |
Unused tax credits | $ 9.6 |  |

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