Revenue from Contracts with Customers - Additional Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2026	Sep. 30, 2025
Revenue from External Customer [Line Items]
Deferred revenue, revenue recognized	$ 551,100
Deferred revenue	771,050	$ 827,065
Total Liabilities held for sale	56,000
Refund liability	44,400	$ 39,700
Revenue, remaining performance obligation, amount	2,514,500
Unrecorded
Revenue from External Customer [Line Items]
Revenue, remaining performance obligation, amount	$ 1,743,400