Acquisitions (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Sep. 30, 2024
Business Acquisition [Line Items]
Goodwill	$ 791,989	$ 806,643
Future amortization expense associated with the acquired intangibles for fiscal year ended September 30, 2023	13,858
Future amortization expense associated with the acquired intangibles for fiscal year ended September 30, 2024	27,237
Future amortization expense associated with the acquired intangibles for fiscal year ended September 30, 2025	27,183
Future amortization expense associated with the acquired intangibles for fiscal year ended September 30, 2026	26,802
Future amortization expense associated with the acquired intangibles for fiscal year ended September 30, 2027	$ 25,894