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Segment Information - Revenues and Percentage of Revenues on Geographical Basis (Detail) - 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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 279,791 | $ 259,505 | $ 257,858 | $ 235,321 | $ 253,205 | $ 230,986 | $ 228,378 | $ 219,600 | $ 1,032,475 | $ 932,169 | $ 881,356
United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 679,425 | 598,765 | 567,443
United Kingdom |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 77,053 | 71,989 | 86,485
Other countries |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 275,997 | $ 261,415 | $ 227,428
Geographic Concentration Risk | Sales Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of risk, Percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Geographic Concentration Risk | United States | Sales Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of risk, Percentage |  |  |  |  |  |  |  |  | 66.00% | 64.00% | 64.00%
Geographic Concentration Risk | United Kingdom | Sales Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of risk, Percentage |  |  |  |  |  |  |  |  | 7.00% | 8.00% | 10.00%
Geographic Concentration Risk | Other countries | Sales Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of risk, Percentage |  |  |  |  |  |  |  |  | 27.00% | 28.00% | 26.00%

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