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Segment and Geographic Information - Revenue By Product 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
Core Group | Operating Segments
Total revenue	1,257,827	1,025,668	868,970
Growth Group | Operating Segments
Total revenue	316,074	222,646	167,544
Focused Solutions Group | Operating Segments
Total revenue	$ 233,258	$ 210,101	$ 219,117

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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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