EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2025	Mar. 31, 2024
Earnings Per Share [Abstract]
Net income	$ 204,287	$ 131,319	$ 120,812	$ 89,411	$ 335,606	$ 210,223
Basic earnings per share
Weighted average shares of common stock outstanding-basic (in shares)	100,291		98,377		100,073	98,123
Basic earnings per common share (usd per share)	$ 2.04		$ 1.23		$ 3.35	$ 2.14
Diluted earnings per share
Weighted average shares of common stock outstanding-basic (in shares)	100,291		98,377		100,073	98,123
Incremental shares (in shares)	642		725		632	716
Weighted average shares of common stock outstanding-diluted (in shares)	100,933		99,102		100,705	98,839
Diluted (loss) earnings per common share (usd per share)	$ 2.02		$ 1.22		$ 3.33	$ 2.13