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Reportable Segments and Geographic Information - Geographic (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
Geographic Information |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 5,305,800 | $ 5,148,000 | $ 4,790,900 | $ 4,910,800 | $ 4,856,400 | $ 4,561,500 | $ 4,427,200 | $ 4,358,300 | $ 20,155,512 | $ 18,203,402 | $ 17,410,825
Long-Lived Assets | 7,486,500 |  |  |  | 7,543,400 |  |  |  | 7,486,500 | 7,543,400 | 7,554,500
United States |  |  |  |  |  |  |  |  |  |  |
Geographic Information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 14,753,400 | 13,042,600 | 12,567,000
Long-Lived Assets | 4,844,100 |  |  |  | 4,779,000 |  |  |  | 4,844,100 | 4,779,000 | 4,763,900
Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Geographic Information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,440,600 | 1,352,700 | 1,278,300
Long-Lived Assets | 369,200 |  |  |  | 382,900 |  |  |  | 369,200 | 382,900 | 394,000
Canada |  |  |  |  |  |  |  |  |  |  |
Geographic Information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,212,300 | 1,159,900 | 866,500
Long-Lived Assets | 513,700 |  |  |  | 600,400 |  |  |  | 513,700 | 600,400 | 615,700
Europe |  |  |  |  |  |  |  |  |  |  |
Geographic Information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,984,100 | 1,869,900 | 1,904,200
Long-Lived Assets | 1,362,300 |  |  |  | 1,362,800 |  |  |  | 1,362,300 | 1,362,800 | 1,368,400
Other foreign countries |  |  |  |  |  |  |  |  |  |  |
Geographic Information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 765,100 | 778,300 | 794,800
Long-Lived Assets | $ 397,200 |  |  |  | $ 418,300 |  |  |  | $ 397,200 | $ 418,300 | $ 412,500

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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