Revenue from Contracts with Customers - Revenue By Geographic Segment (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting [Line Items]
Total revenue	$ 600,049	$ 643,937	$ 2,060,177	$ 1,845,431
Operating Segments
Segment Reporting [Line Items]
Total revenue	600,049	643,937	2,060,177	1,845,431
Americas \| Operating Segments
Segment Reporting [Line Items]
Total revenue	270,305	282,560	966,829	853,352
Europe \| Operating Segments
Segment Reporting [Line Items]
Total revenue	202,535	239,286	773,466	686,458
Asia-Pacific \| Operating Segments
Segment Reporting [Line Items]
Total revenue	$ 127,209	$ 122,091	$ 319,882	$ 305,621

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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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details