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Segment and Geographic Information - Revenue By Geographic Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Total revenue	$ 1,807,159	$ 1,458,415	$ 1,255,631
Operating Segments
Total revenue	1,807,159	1,458,415	1,255,631
Americas | Operating Segments
Total revenue	766,021	649,383	537,548
Europe | Operating Segments
Total revenue	722,977	543,779	464,666
Asia Pacific | Operating Segments
Total revenue	$ 318,161	$ 265,253	$ 253,417

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- 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.

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