Contract Balance - Deferred Revenues (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2024	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Contract with Customer, Liability	$ 150,076	$ 143,235
Revenue recognized that was included in the deferred revenues balance at the beginning of the period	102,063
Increases due to billings, excluding amounts recognized as revenue during the period	108,904
Deferred revenue, current portion	143,600	136,700
Deferred revenue, noncurrent	$ 6,500	$ 6,500