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Business Acquisitions, Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Sep. 30, 2018
Identifiable intangible assets with finite useful lives |  |
Gross Amount | $ 1,303,500 | $ 1,303,400
Accumulated Amortization | (1,048,300) | (983,500)
Intangible Assets, Net | 255,213 | 319,892
Backlog and customer relationships |  |
Identifiable intangible assets with finite useful lives |  |
Gross Amount | 1,285,200 | 1,285,100
Accumulated Amortization | (1,030,100) | (966,000)
Intangible Assets, Net | $ 255,100 | $ 319,100
Backlog and customer relationships | Minimum |  |
Identifiable intangible assets with finite useful lives |  |
Amortization Period | 1 year | 1 year
Backlog and customer relationships | Maximum |  |
Identifiable intangible assets with finite useful lives |  |
Amortization Period | 11 years | 11 years
Trademark / tradename |  |
Identifiable intangible assets with finite useful lives |  |
Gross Amount | $ 18,300 | $ 18,300
Accumulated Amortization | (18,200) | (17,500)
Intangible Assets, Net | $ 100 | $ 800
Trademark / tradename | Minimum |  |
Identifiable intangible assets with finite useful lives |  |
Amortization Period | 3 months 18 days | 3 months 18 days
Trademark / tradename | Maximum |  |
Identifiable intangible assets with finite useful lives |  |
Amortization Period | 2 years | 2 years

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