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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

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+ References

No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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