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STOCK-BASED COMPENSATION - Summary of the Status of Restricted Stock Awards and Changes in Restricted Stock Outstanding (Details) - $ / shares shares in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Restricted Stock
Shares
Outstanding (in shares)	1,280	1,085	1,001
Granted (in shares)	701	781	475
Vested (in shares)	(534)	(501)	(371)
Forfeited (in shares)	(35)	(85)	(20)
Outstanding (in shares)	1,412	1,280	1,085
Weighted-Average Grant Date Fair Value per Share
Outstanding (in dollars per share)	$ 49.81	$ 61.28	$ 63.74
Granted (in dollars per share)	25.61	39.99	58.45
Vested (in dollars per share)	51.79	59.46	64.32
Forfeited (in dollars per share)	35.76	48.98	60.85
Outstanding (in dollars per share)	$ 37.36	$ 49.81	$ 61.28
Phantom Share Units (PSUs)
Shares
Granted (in shares)	18,906
Vested (in shares)	(20,616)

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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