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STOCKHOLDERS' EQUITY AND EQUITY COMPENSATION - Narrative (Details)					1 Months Ended	12 Months Ended
	Aug. 21, 2020 USD ($) $ / shares shares	Aug. 21, 2020 USD ($) $ / shares shares	Aug. 18, 2020 USD ($) $ / shares shares	Jan. 29, 2016 shares	Aug. 31, 2020 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) unit $ / shares shares	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($) $ / 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						$ 0.32	$ 0.30	$ 0.29
Accrued dividends \| $						$ 2,920,000
Sale of stock, number of shares issued (in shares)	8,700,000	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 \| $	$ 178,165,000	$ 14,335,000	$ 163,830,000		$ 178,165,000
Share-based payment award, number of shares authorized (in shares)						4,354,429
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)						152,435
Shares paid for tax withholding for share based compensation, value \| $						$ 3,222,000
Shares paid for tax withholding for share based compensation, value per share (in dollars per share) \| $ / shares						$ 21.14
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Instruments grants in period (in shares)						1,242,906
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)						226,811
Instruments vested in period, fair value \| $						$ 5,500,000
Weighted average grant date fair value (in dollars per share) \| $ / shares						$ 24.25
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, options, vested in period, fair value \| $						$ 10,627,000	$ 17,889,000	$ 4,748,000
Employee service share-based compensation, nonvested awards, compensation not yet recognized, share-based awards other than options \| $						$ 29,686,000
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition						2 years 6 months
Instruments grants in period (in shares)						1,287,330
Weighted average grant date fair value (in dollars per share) \| $ / shares						$ 19.61
Instruments vested in period (in shares)						498,333
Shares paid for tax withholding for share based compensation (in shares)						6,507
Shares paid for tax withholding for share based compensation, value \| $						$ 135,000
Shares paid for tax withholding for share based compensation, value per share (in dollars per share) \| $ / shares						$ 20.75
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						3 years
Instruments grants in period (in shares)						44,424
Instruments vested in period, fair value \| $						$ 1,080,000
Weighted average grant date fair value (in dollars per share) \| $ / shares						$ 24.31
Executive Officer \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Instruments grants in period (in shares)						488,095
Instruments number of persons granted shares (in shares) \| unit						6
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]
Share-based payment award, award vesting period						60 months
Instruments vested in period, fair value \| $						$ 10,836,000
Weighted average grant date fair value (in dollars per share) \| $ / shares						$ 22.20
Senior Executives \| Restricted Stock, Subject to Performance Conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, award vesting period						4 years
Instruments grants in period (in shares)						528,000
Weighted average grant date fair value (in dollars per share) \| $ / shares						$ 14.82
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 \| $						$ 7,824,000
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)						384,000
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)						528,000
Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, number of shares authorized (in shares)				5,050,000					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)						488,376
Incentive Plan \| Incentive Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues (in shares)				600,000