Stockholders' Equity - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Oct. 01, 2024
Class of Stock [Line Items]
Preferred stock, shares authorized	5,000,000	5,000,000
Common stock, shares authorized	500,000,000	500,000,000
Stock repurchased during period (in shares)	1,650,000	0	0
Stock repurchased during period, value	$ 300.0
Maximum
Class of Stock [Line Items]
Common stock, shares authorized	500,000,000
Stock authorized to repurchase				$ 2,000.0
Series A Junior Participating Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized	500,000