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STOCK-BASED COMPENSATION - Summary of the Status of Performance Share Units and Changes in Performance Share Units Outstanding (Details) - Performance Share Units	9 Months Ended
	Jun. 30, 2021 $ / shares shares
Performance Units
Outstanding beginning balance (in shares)	337,000
Granted (in shares)	313,000
Dividend equivalent right performance units credited (in shares)	54,000
Forfeited (in shares)	(11,000)
Outstanding ending balance (in shares)	693,000
Weighted Average Grant Date Fair Value per Share
Outstanding beginning balance (in dollars per share) | $ / shares	$ 51.09
Granted (in dollars per share) | $ / shares	29.77
Dividend equivalent right performance units credited (in dollars per share) | $ / shares	50.65
Forfeited (in dollars per share) | $ / shares	43.40
Outstanding ending balance (in dollars per share) | $ / shares	$ 41.55
Vested (in shares)	87,626
Vested and expected to vest (in shares)	468,303

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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 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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