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STOCK-BASED COMPENSATION - Summary of Information About Stock Options (Details) shares in Thousands	12 Months Ended
	Sep. 30, 2019 $ / shares shares
Outstanding Stock Options
Shares (in shares) | shares	3,238
Exercisable Stock Options
Shares (in shares) | shares	2,482
$0.00 to $40.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower exercise price (in dollars per share)	$ 0
Upper exercise price (in dollars per share)	$ 40
Outstanding Stock Options
Shares (in shares) | shares	209
Weighted-Average Remaining Life	5 days
Weighted-Average Exercise Price (in dollars per share)	$ 38.02
Exercisable Stock Options
Shares (in shares) | shares	209
Weighted-Average Exercise Price (in dollars per share)	$ 38.02
$40.00 to $55.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower exercise price (in dollars per share)	40
Upper exercise price (in dollars per share)	$ 55
Outstanding Stock Options
Shares (in shares) | shares	493
Weighted-Average Remaining Life	2 years 11 months 4 days
Weighted-Average Exercise Price (in dollars per share)	$ 51.85
Exercisable Stock Options
Shares (in shares) | shares	468
Weighted-Average Exercise Price (in dollars per share)	$ 51.78
$55.00 to $70.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower exercise price (in dollars per share)	55
Upper exercise price (in dollars per share)	$ 70
Outstanding Stock Options
Shares (in shares) | shares	2,032
Weighted-Average Remaining Life	6 years 1 month 2 days
Weighted-Average Exercise Price (in dollars per share)	$ 60.53
Exercisable Stock Options
Shares (in shares) | shares	1,432
Weighted-Average Exercise Price (in dollars per share)	$ 61.26
$70.00 to $85.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower exercise price (in dollars per share)	70
Upper exercise price (in dollars per share)	$ 85
Outstanding Stock Options
Shares (in shares) | shares	504
Weighted-Average Remaining Life	5 years 11 months 12 days
Weighted-Average Exercise Price (in dollars per share)	$ 80.49
Exercisable Stock Options
Shares (in shares) | shares	373
Weighted-Average Exercise Price (in dollars per share)	$ 80.34

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Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable [Abstract]

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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