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Business Combinations, Discontinued Operations, Divestitures and Assets and Liabilities Held for Sale - Additional Information (Detail) $ in Millions |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 15, 2022 USD ($) | Apr. 01, 2022 USD ($) | Oct. 01, 2021 USD ($) | Jul. 30, 2021 | Apr. 30, 2021 | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) Plant | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Aug. 09, 2022 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assumed asset retirement obligations liability |  |  |  |  |  | $ 171.4 |  |  | $ 293.8 |  |
Total Revenues |  |  |  |  |  | 1,811.7 | $ 1,557.3 |  | 4,684.2 | $ 3,917.6 |
Cash used for operating and investing activities for discontinued operations |  |  |  |  |  |  |  |  | 200.9 |  |
Proceeds from divestitures |  |  |  |  |  |  |  |  | 249.9 |  |
Capital expenditures |  |  |  |  |  |  |  |  | 13.2 |  |
Business combination number of California ready mix operations | Plant |  |  |  |  |  |  |  | 14 |  |  |
Total Revenues |  |  |  |  |  |  |  | $ 235.0 |  |  | $ 350.0
Interest payable | $ 15.0 |  |  |  |  |  |  |  |  |  |
Goodwill Increased |  |  |  |  |  | 171.4 |  |  | 293.8 |  |
Colorado and Central Texas |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pretax gain |  | $ 151.9 |  |  |  |  |  |  | $ 151.9 |  |
Lehigh West Region |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business combination, effective date |  |  | 2021-10 |  |  |  |  |  |  |  |
Cash transferred in business combination |  |  | $ 2,260.0 |  |  |  |  |  |  |  |
Intangible assets fair value adjustment |  |  |  |  |  | 119.5 |  |  |  |  |
Asset retirement obligations and other liabilities purchase accounting adjustments |  |  |  |  |  | 50.9 |  |  |  |  |
Southern Crushed Concrete |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business combination, effective date |  |  |  | 2021-07 |  |  |  |  |  |  |
Assumed asset retirement obligations liability |  |  |  |  |  | 64.5 |  |  |  |  |
Intangible assets fair value adjustment |  |  |  |  |  | 64.0 |  |  |  |  |
Goodwill Increased |  |  |  |  |  | $ 64.5 |  |  |  |  |
Tiller Corporation |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business combination, effective date |  |  |  |  | 2021-04 |  |  |  |  |  |

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