Acquisitions (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024
Business Acquisition [Line Items]
Goodwill	$ 781,928	$ 806,643
Future amortization expense associated with the acquired intangibles for fiscal year ended September 30, 2023	19,773
Future amortization expense associated with the acquired intangibles for fiscal year ended September 30, 2024	27,390
Future amortization expense associated with the acquired intangibles for fiscal year ended September 30, 2025	27,331
Future amortization expense associated with the acquired intangibles for fiscal year ended September 30, 2026	26,955
Future amortization expense associated with the acquired intangibles for fiscal year ended September 30, 2027	$ 26,047