STOCK-BASED COMPENSATION - Summary of Stock Option Activities (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Jun. 30, 2024
Performance Shares
Number of Shares
Outstanding, beginning balance (in shares)	1,114,261
Granted (in shares)	0
Exercised (in shares)	(245,891)
Cancelled/Forfeited (in shares)	0
Outstanding, ending balance (in shares)	868,370
Weighted Average Exercise Price Per Share
Outstanding, beginning balance (in dollars per share)	$ 23.00
Granted (in dollars per share)	0
Exercised (in dollars per share)	23.00
Cancelled/Forfeited (in dollars per share)	0
Outstanding, ending balance (in dollars per share)	$ 23.00
Stock Options Additional Disclosures
Vested and exercisable (in shares)	868,370
Vested and exercisable (in dollars per share)	$ 23.00
Weighted Average Remaining Contract Term, Outstanding	5 years 10 months 24 days
Weighted Average Remaining Contract Term, Vested and exercisable	5 years 10 months 24 days
Aggregate Intrinsic Value, Outstanding	$ 16,612
Aggregate Intrinsic Value, Vested and exercisable	$ 16,612
Service Based Stock Option Activity
Number of Shares
Outstanding, beginning balance (in shares)	3,361,707
Granted (in shares)	138,731
Exercised (in shares)	(557,555)
Cancelled/Forfeited (in shares)	(20,044)
Outstanding, ending balance (in shares)	2,922,839
Weighted Average Exercise Price Per Share
Outstanding, beginning balance (in dollars per share)	$ 25.43
Granted (in dollars per share)	38.15
Exercised (in dollars per share)	24.69
Cancelled/Forfeited (in dollars per share)	42.36
Outstanding, ending balance (in dollars per share)	$ 26.06
Stock Options Additional Disclosures
Vested and exercisable (in shares)	2,464,991
Vested and exercisable (in dollars per share)	$ 25.07
Weighted Average Remaining Contract Term, Outstanding	6 years 6 months
Weighted Average Remaining Contract Term, Vested and exercisable	6 years 2 months 12 days
Aggregate Intrinsic Value, Outstanding	$ 47,200
Aggregate Intrinsic Value, Vested and exercisable	$ 42,208