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STOCKHOLDERS' EQUITY AND EQUITY COMPENSATION - Narrative (Details)							1 Months Ended	12 Months Ended
	Nov. 16, 2022 USD ($) unit $ / shares shares	Jun. 27, 2022 $ / shares	Feb. 17, 2022 shares	Aug. 21, 2020 USD ($) $ / shares shares	Aug. 21, 2020 USD ($) $ / shares shares	Aug. 18, 2020 USD ($) $ / shares shares	Aug. 31, 2020 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) unit $ / shares shares	Sep. 30, 2021 USD ($) $ / shares	Sep. 30, 2020 USD ($) $ / shares shares	Jan. 30, 2020 shares	Aug. 01, 2018 USD ($)	Jan. 31, 2018 shares	Aug. 03, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, dividends, per share, cash paid (in dollars per share) \| $ / shares								$ 0.36	$ 0.32	$ 0.30
Accrued dividends \| $								$ 9,514,000
Sale of stock, number of shares issued (in shares)				700,000	8,700,000	8,000,000	8,700,000
Sale of stock, stock price (in dollars per share) \| $ / shares				$ 21.50	$ 21.50	$ 21.50	$ 21.50
Net process from sale of stock \| $				$ 14,335,000	$ 178,165,000	$ 163,830,000	$ 178,165,000
Share-based payment award, number of shares authorized (in shares)								4,538,689
Number of additional shares authorized (in shares)			1,200,000
Number of shares issued out of treasury stock (in shares)								502,113
Stock repurchase program, authorized amount \| $												$ 50,000,000		$ 50,000,000
Stock repurchased during period (in shares)										0
Stock repurchase program, remaining authorized repurchase amount \| $								$ 57,955,000
Shares paid for tax withholding for share based compensation (in shares)								421,860
Shares paid for tax withholding for share based compensation, value \| $								$ 10,742,000
Shares paid for tax withholding for share based compensation, value per share (in dollars per share) \| $ / shares								$ 25.46
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends payable, amount per share (in dollars per share) \| $ / shares	$ 0.10
Special Cash Dividends
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, dividends declared (in dollars per share) \| $ / shares		$ 2.00
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Instruments grants in period (in shares)								946,371
Restricted Stock and Restricted Stock Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, award vesting period								3 years
Restricted Stock and Restricted Stock Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, award vesting period								4 years
Restricted Stock and Restricted Stock Units, Subject To Performance Conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, award vesting period								3 years
Instruments grants in period (in shares)								218,162
Instruments vested in period, fair value \| $								$ 6,285,000
Weighted average grant date fair value (in dollars per share) \| $ / shares								$ 28.81
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, options, vested in period, fair value \| $								$ 25,863,000	$ 10,627,000	$ 17,889,000
Employee service share-based compensation, nonvested awards, compensation not yet recognized, share-based awards other than options \| $								$ 30,301,000
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition								2 years
Instruments grants in period (in shares)								1,004,755
Weighted average grant date fair value (in dollars per share) \| $ / shares								$ 21.35
Instruments vested in period (in shares)								1,015,740
Shares paid for tax withholding for share based compensation (in shares)								5,480
Shares paid for tax withholding for share based compensation, value \| $								$ 144,000
Shares paid for tax withholding for share based compensation, value per share (in dollars per share) \| $ / shares								$ 26.31
Restricted Stock \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, award vesting period	36 months
Instruments grants in period (in shares)	466,677
Director \| Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, award vesting period								1 year
Instruments grants in period (in shares)								58,384
Instruments vested in period, fair value \| $								$ 1,375,000
Weighted average grant date fair value (in dollars per share) \| $ / shares								$ 23.55
Executive Officer and Key Employees \| Restricted Stock, Subject to Performance Conditions \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Instruments grants in period (in shares)	261,381
Instruments vested in period, fair value \| $	$ 8,785,000
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 33.61
Instruments number of persons granted shares (in shares) \| unit	44
Executive Officer \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Instruments grants in period (in shares)								274,063
Instruments number of persons granted shares (in shares) \| unit								17
Executive Officer \| Restricted Stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, award vesting period								34 months
Executive Officer \| Restricted Stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Instruments vested in period, fair value \| $								$ 6,240,000
Weighted average grant date fair value (in dollars per share) \| $ / shares								$ 22.77
Senior Executives \| Restricted Stock, Subject to Performance Conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Instruments grants in period (in shares)								454,146
Weighted average grant date fair value (in dollars per share) \| $ / shares								$ 24.03
Instruments number of persons granted shares (in shares) \| unit								2
Post-vesting holding period								2 years
Equity instruments other than options, granted in period, fair value \| $								$ 5,456,000
Senior Executives \| Restricted Stock, Subject to Performance Conditions \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Instruments vested in period, fair value \| $	$ 3,555,000
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 34.63
Instruments number of persons granted shares (in shares) \| unit	2
Post-vesting holding period	2 years
Target number of shares in period (in shares)	102,648
Senior Executives \| Restricted Stock, Subject to Performance Conditions \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Instruments vested in period (in shares)								113,538
Senior Executives \| Restricted Stock, Subject to Performance Conditions \| Minimum \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Instruments vested in period (in shares)	51,324
Senior Executives \| Restricted Stock, Subject to Performance Conditions \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Instruments vested in period (in shares)								454,146
Senior Executives \| Restricted Stock, Subject to Performance Conditions \| Maximum \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Instruments grants in period (in shares)	205,296
Instruments vested in period (in shares)	205,296
Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, number of shares authorized (in shares)								6,250,000			1,700,000		1,000,000
Share-based payment award, expiration period								10 years
Maximum percentage of exercise price at grant date fair value								100.00%
Share-based payment award, number of shares available for grant (in shares)								835,122
Incentive Plan \| Incentive Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, number of shares authorized (in shares)								600,000