Summary of Significant Accounting Policies - Revenue for Operating Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Total revenue	$ 1,548,688	$ 1,105,992
United States
Property, Plant and Equipment [Line Items]
Total revenue	1,537,621	1,105,992
Rest of world
Property, Plant and Equipment [Line Items]
Total revenue	$ 11,067	$ 0