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Business combinations and disposals - K-12 Education (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on disposal |  |  |  |  |  |  |  |  | $ 0 | $ 650 | $ 6,880
Revenue | $ 558,446 | $ 597,855 | $ 612,787 | $ 623,148 | $ 620,903 | $ 600,447 | $ 622,047 | $ 607,564 | 2,392,236 | 2,450,961 | 2,403,360
Operating income (loss) | $ 61,908 | $ 82,571 | $ 71,321 | $ 79,683 | $ 77,590 | $ 81,811 | $ 80,335 | $ 73,776 | $ 295,483 | 313,512 | 286,603
K-12 Education |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 2,200
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | (200)
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Related to Disposition of K-12 Education [Member] | K-12 Education |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on disposal |  |  |  |  |  |  |  |  |  | $ 700 | $ 6,900

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