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STOCK-BASED COMPENSATION - Summary of the Status of Restricted Stock Awards and Changes in Restricted Stock Outstanding (Details)	9 Months Ended
	Jun. 30, 2021 $ / shares shares
Restricted Stock Awards
Performance Units
Outstanding beginning balance (in shares)	1,280,000
Granted (in shares)	698,000
Vested (in shares)	(534,000)
Forfeited (in shares)	(27,000)
Outstanding ending balance (in shares)	1,417,000
Weighted Average Grant Date Fair Value per Share
Outstanding beginning balance (in dollars per share) | $ / shares	$ 49.81
Granted (in dollars per share) | $ / shares	25.60
Vested (in dollars per share) | $ / shares	51.79
Forfeited (in dollars per share) | $ / shares	35.49
Outstanding ending balance (in dollars per share) | $ / shares	$ 37.38
Phantom Share Units (PSUs)
Performance Units
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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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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