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Business Acquisitions, Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Jun. 30, 2019
Business Acquisitions, Goodwill and Intangible Assets |
Schedule of changes in the carrying value of goodwill by reportable segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ |  | ​ | ​ | ​ | Foreign | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | ​ | ​ | Exchange | ​ | June 30,
​ |  | 2018 | ​ | Disposal | ​ | Impact |  | 2019
​ | ​ | (in millions)
Design and Consulting Services | ​ | $ | 3,189.2 | ​ | $ | (0.4) | ​ | $ | (6.2) | ​ | $ | 3,182.6
Construction Services | ​ | ​ | 1,008.9 | ​ | ​ | — | ​ | ​ | (1.8) | ​ | ​ | 1,007.1
Management Services | ​ |  | 1,723.0 | ​ | ​ | — | ​ | ​ | (6.2) | ​ |  | 1,716.8
Total | ​ | $ | 5,921.1 | ​ | $ | (0.4) | ​ | $ | (14.2) | ​ | $ | 5,906.5
Schedule of finite-lived intangible assets by major class | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2019 | ​ | September 30, 2018 | ​ | ​ | ​ | ​
​ | ​ | Gross | ​ | Accumulated | ​ | Intangible | ​ | Gross | ​ | Accumulated | ​ | Intangible | ​ | Amortization
​ |  | Amount |  | Amortization |  | Assets, Net |  | Amount |  | Amortization |  | Assets, Net |  | Period
​ | ​ | (in millions) | ​ | (years)
Backlog and customer relationships | ​ | $ | 1,285.2 | ​ | $ | (1,030.1) | ​ | $ | 255.1 | ​ | $ | 1,285.1 | ​ | $ | (966.0) | ​ | $ | 319.1 |  | 1 | - | 11
Trademark / tradename | ​ |  | 18.3 | ​ |  | (18.2) | ​ |  | 0.1 | ​ |  | 18.3 | ​ |  | (17.5) | ​ |  | 0.8 |  | 0.3 | - | 2
Total | ​ | $ | 1,303.5 | ​ | $ | (1,048.3) | ​ | $ | 255.2 | ​ | $ | 1,303.4 | ​ | $ | (983.5) | ​ | $ | 319.9 | ​ | ​ | ​ | ​
Schedule of estimated future amortization expense of intangible assets | ​
​ | ​ | ​ | ​
Fiscal Year |  | (in millions)
2019 (three months remaining) | ​ | $ | 20.7
2020 | ​ |  | 69.4
2021 | ​ |  | 56.5
2022 | ​ |  | 43.7
2023 | ​ |  | 39.3
Thereafter | ​ |  | 25.6
Total | ​ | $ | 255.2
​

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