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STOCK-BASED COMPENSATION - Summary of the Status of Restricted Stock Awards and Changes in Restricted Stock Outstanding (Details) - Restricted Stock Awards shares in Thousands	6 Months Ended
	Mar. 31, 2020 $ / shares shares
Shares
Outstanding (in shares) | shares	1,085
Granted (in shares) | shares	781
Vested (in shares) | shares	(415)
Forfeited (in shares) | shares	(15)
Outstanding (in shares) | shares	1,436
Weighted Average Grant Date Fair Value per Share
Outstanding (in dollars per share) | $ / shares	$ 61.28
Granted (in dollars per share) | $ / shares	39.99
Vested (in dollars per share) | $ / shares	62.15
Forfeited (in dollars per share) | $ / shares	50.75
Outstanding (in dollars per share) | $ / shares	$ 49.56

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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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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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