STOCK-BASED COMPENSATION - Summary of Information About Stock Options (Details) shares in Thousands	12 Months Ended
	Sep. 30, 2020 $ / shares shares
Outstanding Stock Options
Shares (in shares) | shares	2,863
Exercisable Stock Options
Shares (in shares) | shares	2,515
$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	472
Weighted-Average Remaining Life	1 year 9 months 25 days
Weighted-average exercise price (in dollars per share)	$ 51.86
Exercisable Stock Options
Shares (in shares) | shares	462
Weighted-average exercise price of exercisable stock options (in dollars per share)	$ 51.83
$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	1,918
Weighted-Average Remaining Life	5 years 25 days
Weighted-average exercise price (in dollars per share)	$ 60.56
Exercisable Stock Options
Shares (in shares) | shares	1,641
Weighted-average exercise price of exercisable stock options (in dollars per share)	$ 60.82
$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	473
Weighted-Average Remaining Life	4 years 11 months 1 day
Weighted-average exercise price (in dollars per share)	$ 80.47
Exercisable Stock Options
Shares (in shares) | shares	412
Weighted-average exercise price of exercisable stock options (in dollars per share)	$ 80.43