Business Acquisitions	12 Months Ended
Sep. 30, 2020
Business Combinations [Abstract]
Business Acquisitions	Business Acquisitions Alabama Acquisition - July 2019 On July 12, 2019, a subsidiary of the Company acquired substantially all of the assets of an HMA manufacturing plant and paving company located near Gadsden, Alabama. The acquired business is expected to benefit from synergies resulting from its proximity to the Company’s preexisting operations in northeast Alabama, including an aggregates quarry. The acquisition was accounted for as a business combination in accordance with ASC 805. The purchase price of $5.0 million was paid from cash on hand at closing. Identifiable assets acquired and liabilities assumed were recorded at their estimated fair values based on the methodology described under “Fair Value Measurements” in Note 2 - Significant Accounting Policies. The amounts allocated were not material to the Company’s Consolidated Balance Sheets. The amount of the purchase price exceeding the net fair value of identifiable assets acquired and liabilities assumed was recorded as goodwill in the amount of approximately $2.4 million, which is deductible for income tax purposes. Goodwill primarily represents the assembled work force and synergies expected to result from the acquisition. The results of operations since the July 12, 2019 acquisition date attributable to this acquisition are included in the Company’s consolidated financial statements and were not material to the Consolidated Statements of Income for the fiscal year ended September 30, 2019. Pro forma results of operations as if the acquisition had been consummated on October 1, 2018 would not be material to the Consolidated Statements of Income. The Company recorded certain costs to effect the acquisition as they were incurred, which are reflected as general and administrative expenses on the Consolidated Statements of Income in the amount of $0.1 million for the fiscal year ended September 30, 2019. Florida Acquisition - February 2019 On February 28, 2019, a subsidiary of the Company acquired substantially all of the assets of an HMA and ready-mix concrete business located in Okeechobee, Florida. This transaction enables the Company to serve new markets in south central Florida through an expanded geographic presence in the state. The acquisition was accounted for as a business combination in accordance with ASC 805. The purchase price of $8.9 million was paid from cash on hand at closing. Identifiable assets acquired and liabilities assumed were recorded at their estimated fair values based on the methodology described under “Fair Value Measurements” in Note 2 - Significant Accounting Policies. The amounts allocated were not material to the Company’s Consolidated Balance Sheets. The purchase price exceeding the net fair value of identifiable assets acquired and liabilities assumed was recorded as goodwill and other identifiable intangible assets, including customer relationships and customer backlog, in the amount of $3.2 million, which is deductible for income tax purposes. Goodwill primarily represents the assembled work force and synergies expected to result from the acquisition. The results of operations since the February 28, 2019 acquisition date attributable to this acquisition are included in the consolidated financial statements since the acquisition date and were not material to the Consolidated Statements of Income for the year fiscal ended September 30, 2019. Pro forma results of operations as if the acquisition had been consummated on October 1, 2018 would not be material to the Consolidated Statements of Income. The Company recorded certain costs to effect the acquisition as they were incurred, which are reflected as general and administrative expenses on the Consolidated Statements of Income in the amount of $0.1 million for the fiscal year ended September 30, 2019. Florida Acquisition - October 2019 On October 1, 2019, a subsidiary of the Company acquired substantially all of the assets of an HMA manufacturing plant and paving company located in Palm City, Florida. The acquisition was accounted for as a business combination in accordance with ASC Topic 805, Business Combinations (“Topic 805”). The purchase price of $17.7 million was paid from cash on hand at closing. Identifiable assets acquired and liabilities assumed were recorded at their estimated fair values based on the methodology described under Fair Value Measurements in Note 2 - Significant Accounting Policies. The amounts allocated were not material to the Company’s Consolidated Balance Sheets. The amount of the purchase price exceeding the net fair value of identifiable assets acquired and liabilities assumed was recorded as goodwill in the amount of approximately $7.7 million, which is deductible for income tax purposes. Goodwill primarily represents the assembled work force and synergies expected to result from the acquisition. The results of operations since the October 1, 2019 acquisition date attributable to this acquisition are included in the Company's consolidated financial statements and were not material to the Consolidated Statements of Income for the fiscal year ended September, 30, 2020. The Company recorded certain costs to effect the acquisition as they were incurred, which are reflected in general and administrative expenses on the Company’s Consolidated Statements of Income in the amount of $0.1 million for the fiscal year ended September 30, 2020. Florida Acquisition - March 2020 On March 23, 2020, a subsidiary of the Company acquired two HMA manufacturing plants and certain related assets located in Pensacola and DeFuniak Springs, Florida. The acquisition was accounted for as a business combination in accordance with Topic 805. The $9.8 million purchase price was paid in cash at closing, with an additional $2.7 million of cash paid for plant inventory. Identifiable assets acquired and liabilities assumed were recorded at their estimated fair values based on the methodology described under Fair Value Measurements in Note 2 - Significant Accounting Policies. The amounts allocated were not material to the Company’s Consolidated Balance Sheets. The amount of the purchase price exceeding the net fair value of identifiable assets acquired and liabilities assumed was recorded as goodwill in the amount of approximately $0.1 million, which is deductible for income tax purposes. Goodwill primarily represents the assembled work force and synergies expected to result from the acquisition. The results of operations since the March 23, 2020 acquisition date attributable to this acquisition are included in the Company's consolidated financial statements and were not material to the Consolidated Statements of Income for the fiscal year ended September, 30, 2020. Pro forma results of operations as if the acquisition had been consummated October 1, 2019 would not be material to the Consolidated Statements of Income. The Company recorded certain costs to effect the acquisition as they were incurred, which are reflected in general and administrative expenses on the Company’s Consolidated Statements of Income in the amount of $0.1 million for the fiscal year ended September 30, 2020. Combined Acquisitions Completed During the Fiscal Year Ended September 30, 2020 For acquisitions completed during the fiscal year ended September 30, 2020, we paid combined consideration of $30.2 million, allocated as follows: $3.1 million of inventory, $19.3 million of property, plant and equipment and goodwill of $7.8 million. The Consolidated Statement of Income for the fiscal year ended September 30, 2020 includes $42.9 million of revenue attributable to the operations of fiscal year 2020 acquisitions from their respective acquisition dates through September 30, 2020. Unaudited pro forma revenues, as if the fiscal year 2020 acquisitions had been completed as of October 1, 2018, are $793.7 million and $831.8 million for the fiscal years ended September 30, 2020 and 2019, respectively. Pro forma information is presented for informational purposes and may not be indicative of revenue that would have been achieved if the acquisitions had actually occurred on October 1, 2018.

On July 12, 2019, a subsidiary of the Company acquired substantially all of the assets of an HMA manufacturing plant and paving company located near Gadsden, Alabama. The acquired business is expected to benefit from synergies resulting from its proximity to the Company’s preexisting operations in northeast Alabama, including an aggregates quarry. The acquisition was accounted for as a business combination in accordance with ASC 805. The purchase price of $5.0 million was paid from cash on hand at closing.

Identifiable assets acquired and liabilities assumed were recorded at their estimated fair values based on the methodology described under “Fair Value Measurements” in Note 2 - Significant Accounting Policies. The amounts allocated were not material to the Company’s Consolidated Balance Sheets. The amount of the purchase price exceeding the net fair value of identifiable assets acquired and liabilities assumed was recorded as goodwill in the amount of approximately $2.4 million, which is deductible for income tax purposes. Goodwill primarily represents the assembled work force and synergies expected to result from the acquisition.

The results of operations since the July 12, 2019 acquisition date attributable to this acquisition are included in the Company’s consolidated financial statements and were not material to the Consolidated Statements of Income for the fiscal year ended September 30, 2019. Pro forma results of operations as if the acquisition had been consummated on October 1, 2018 would not be material to the Consolidated Statements of Income.

The Company recorded certain costs to effect the acquisition as they were incurred, which are reflected as general and administrative expenses on the Consolidated Statements of Income in the amount of $0.1 million for the fiscal year ended September 30, 2019.

On February 28, 2019, a subsidiary of the Company acquired substantially all of the assets of an HMA and ready-mix concrete business located in Okeechobee, Florida. This transaction enables the Company to serve new markets in south central Florida through an expanded geographic presence in the state. The acquisition was accounted for as a business combination in accordance with ASC 805. The purchase price of $8.9 million was paid from cash on hand at closing.

Identifiable assets acquired and liabilities assumed were recorded at their estimated fair values based on the methodology described under “Fair Value Measurements” in Note 2 - Significant Accounting Policies. The amounts allocated were not material to the Company’s Consolidated Balance Sheets. The purchase price exceeding the net fair value of identifiable assets acquired and liabilities assumed was recorded as goodwill and other identifiable intangible assets, including customer relationships and customer backlog, in the amount of $3.2 million, which is deductible for income tax purposes. Goodwill primarily represents the assembled work force and synergies expected to result from the acquisition.

The results of operations since the February 28, 2019 acquisition date attributable to this acquisition are included in the consolidated financial statements since the acquisition date and were not material to the Consolidated Statements of Income for the year fiscal ended September 30, 2019. Pro forma results of operations as if the acquisition had been consummated on October 1, 2018 would not be material to the Consolidated Statements of Income.

On October 1, 2019, a subsidiary of the Company acquired substantially all of the assets of an HMA manufacturing plant and paving company located in Palm City, Florida. The acquisition was accounted for as a business combination in accordance with ASC Topic 805, Business Combinations (“Topic 805”). The purchase price of $17.7 million was paid from cash on hand at closing.

Identifiable assets acquired and liabilities assumed were recorded at their estimated fair values based on the methodology described under Fair Value Measurements in Note 2 - Significant Accounting Policies. The amounts allocated were not material to the Company’s Consolidated Balance Sheets. The amount of the purchase price exceeding the net fair value of identifiable assets acquired and liabilities assumed was recorded as goodwill in the amount of approximately $7.7 million, which is deductible for income tax purposes. Goodwill primarily represents the assembled work force and synergies expected to result from the acquisition.

The results of operations since the October 1, 2019 acquisition date attributable to this acquisition are included in the Company's consolidated financial statements and were not material to the Consolidated Statements of Income for the fiscal year ended September, 30, 2020.

The Company recorded certain costs to effect the acquisition as they were incurred, which are reflected in general and administrative expenses on the Company’s Consolidated Statements of Income in the amount of $0.1 million for the fiscal year ended September 30, 2020.

On March 23, 2020, a subsidiary of the Company acquired two HMA manufacturing plants and certain related assets located in Pensacola and DeFuniak Springs, Florida. The acquisition was accounted for as a business combination in accordance with Topic 805. The $9.8 million purchase price was paid in cash at closing, with an additional $2.7 million of cash paid for plant inventory.

Identifiable assets acquired and liabilities assumed were recorded at their estimated fair values based on the methodology described under Fair Value Measurements in Note 2 - Significant Accounting Policies. The amounts allocated were not material to the Company’s Consolidated Balance Sheets. The amount of the purchase price exceeding the net fair value of identifiable assets acquired and liabilities assumed was recorded as goodwill in the amount of approximately $0.1 million, which is deductible for income tax purposes. Goodwill primarily represents the assembled work force and synergies expected to result from the acquisition.

The results of operations since the March 23, 2020 acquisition date attributable to this acquisition are included in the Company's consolidated financial statements and were not material to the Consolidated Statements of Income for the fiscal year ended September, 30, 2020. Pro forma results of operations as if the acquisition had been consummated October 1, 2019 would not be material to the Consolidated Statements of Income.

For acquisitions completed during the fiscal year ended September 30, 2020, we paid combined consideration of $30.2 million, allocated as follows: $3.1 million of inventory, $19.3 million of property, plant and equipment and goodwill of $7.8 million. The Consolidated Statement of Income for the fiscal year ended September 30, 2020 includes $42.9 million of revenue attributable to the operations of fiscal year 2020 acquisitions from their respective acquisition dates through September 30, 2020.

Unaudited pro forma revenues, as if the fiscal year 2020 acquisitions had been completed as of October 1, 2018, are $793.7 million and $831.8 million for the fiscal years ended September 30, 2020 and 2019, respectively. Pro forma information is presented for informational purposes and may not be indicative of revenue that would have been achieved if the acquisitions had actually occurred on October 1, 2018.