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Business segments - Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Revenues and total long-lived assets |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 754,966 | $ 730,710 | $ 736,520 | $ 664,619 | $ 558,446 | $ 597,855 | $ 612,787 | $ 623,148 | $ 2,886,815 | $ 2,392,236 | $ 2,450,961
United States |  |  |  |  |  |  |  |  |  |  |
Revenues and total long-lived assets |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,287,685 | 1,692,823 | 1,765,661
United Kingdom |  |  |  |  |  |  |  |  |  |  |
Revenues and total long-lived assets |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 293,695 | 347,026 | 346,342
Australia |  |  |  |  |  |  |  |  |  |  |
Revenues and total long-lived assets |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 198,795 | 247,850 | 232,434
Rest of World |  |  |  |  |  |  |  |  |  |  |
Revenues and total long-lived assets |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 106,640 | $ 104,537 | $ 106,524

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