STOCK-BASED COMPENSATION - Stock options (Details) - Stock options shares in Thousands	12 Months Ended
	Sep. 30, 2018 Y $ / shares shares	Sep. 30, 2017 $ / shares shares	Sep. 30, 2016 $ / shares shares
Stock based award plan
Vesting period	1 year
Option vesting (as a percent)	25.00%
Number of consecutive years that options vest | Y	4
Weighted-average assumptions utilized in determining the fair value of options
Risk-free interest rate (as a percent)	2.20%	2.00%	1.80%
Expected stock volatility (as a percent)	36.10%	38.90%	37.60%
Dividend yield (as a percent)	4.70%	3.70%	4.60%
Expected term (in years)	6 years	5 years 6 months	5 years 6 months
Options
Weighted-average fair value of options granted (in dollars per share)	$ 13.17	$ 20.48	$ 13.12
Options outstanding at the beginning of the period (in shares) | shares	3,278	3,312	2,776
Granted (in shares) | shares	694	396	876
Exercised (in shares) | shares	(375)	(415)	(220)
Forfeited/Expired (in shares) | shares	(98)	(15)	(120)
Option outstanding at the end of the period (in shares) | shares	3,499	3,278	3,312
Exercisable at the end of the period (in shares) | shares	2,193	2,167	2,225
Shares available to grant | shares	5,140	5,624	6,600
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 56.41	$ 51.74	$ 48.51
Granted (in dollars per share)	59.03	76.61	58.25
Exercised (in dollars per share)	36.88	38.04	31.52
Forfeited/Expired (in dollars per share)	70.77	68.32	61.80
Outstanding at the end of the period (in dollars per share)	58.62	56.41	51.74
Vested and expected to vest at the end of the period (in dollars per share)	62.49
Exercisable at the end of the period (in dollars per share)	$ 56.31	$ 50.87	$ 46.66