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Segment and Geographic Information - Revenue By Geographic Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Total revenue	$ 1,458,415	$ 1,255,631	$ 1,241,824
Operating Segments
Total revenue	1,458,415	1,255,631	1,241,824
Calculated under Revenue Guidance in Effect before Topic 606
Total revenue		1,311,494	1,241,824
Calculated under Revenue Guidance in Effect before Topic 606 | Operating Segments
Total revenue		1,311,494
Americas | Operating Segments
Total revenue	649,383	537,548	511,237
Americas | Calculated under Revenue Guidance in Effect before Topic 606 | Operating Segments
Total revenue		565,362
Europe | Operating Segments
Total revenue	543,779	464,666	485,851
Europe | Calculated under Revenue Guidance in Effect before Topic 606 | Operating Segments
Total revenue		494,864
Asia Pacific | Operating Segments
Total revenue	$ 265,253	253,417	$ 244,736
Asia Pacific | Calculated under Revenue Guidance in Effect before Topic 606 | Operating Segments
Total revenue		$ 251,268

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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