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STOCK-BASED COMPENSATION - Summary of the Status of Restricted Stock Awards and Changes in Restricted Stock Outstanding (Details)	6 Months Ended
	Mar. 31, 2021 $ / shares shares
Restricted Stock Awards
Performance Units
Outstanding (in shares)	1,280,000
Granted (in shares)	698,000
Vested (in shares)	(528,000)
Forfeited (in shares)	(17,000)
Outstanding (in shares)	1,433,000
Weighted Average Grant Date Fair Value per Share
Outstanding (in dollars per share) | $ / shares	$ 49.81
Granted (in dollars per share) | $ / shares	25.60
Vested (in dollars per share) | $ / shares	51.73
Forfeited (in dollars per share) | $ / shares	36.18
Outstanding (in dollars per share) | $ / shares	$ 37.45
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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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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