Earnings Per Share - Basic (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Numerator
Net income attributable to common stockholders	$ 101,781	$ 68,935	$ 49,001
Denominator
Weighted average number of basic common shares outstanding, basic (in shares)	54,943,919	51,883,760	51,827,001
Net income per basic common share attributable to common stockholders (in dollars per share)	$ 1.85	$ 1.33	$ 0.95