STOCK-BASED COMPENSATION - Incentive Plan (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Nov. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Common-stock based award plan
Compensation expense (in dollars)		$ 24,383	$ 25,195	$ 26,703
Excess tax benefit from stock-based compensation		$ 934	3,772	26,616
Stock options
Common-stock based award plan
The period from the grant date after which options expire		10 years
Compensation expense (in dollars)		$ 8,290	$ 8,846	$ 11,268
Option vesting rights (as a percent)		25.00%
Weighted-average assumptions utilized in determining the fair value of options
Risk-free interest rate (as a percent)		1.80%	1.70%	1.60%
Expected stock volatility (as a percent)		37.60%	36.90%	52.60%
Dividend yield (as a percent)		4.60%	3.90%	3.10%
Expected term (in years)		5 years 6 months	5 years 6 months	5 years 6 months
Weighted-average fair value of options granted (in dollars per share)		$ 13.12	$ 16.39	$ 29.44
Options
Options outstanding at the beginning of the period (in shares)		2,776,000	2,629,000	3,991,000
Granted (in shares)	876,379	876,000	420,000	261,000
Exercised (in shares)		(220,000)	(255,000)	(1,613,000)
Forfeited/Expired (in shares)		(120,000)	(18,000)	(10,000)
Option outstanding at the end of the period (in shares)		3,312,000	2,776,000	2,629,000
Exercisable at the end of the period (in shares)		2,225,000	2,014,000	1,884,000
Shares available to grant		6,600,000	2,515,000	3,432,000
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)		$ 48.51	$ 43.46	$ 34.12
Granted (in dollars per share)		58.25	68.83	79.67
Exercised (in dollars per share)		31.52	28.46	26.08
Forfeited/Expired (in dollars per share)		61.80	66.78	68.82
Outstanding at the end of the period (in dollars per share)		51.74	48.51	43.46
Exercisable at the end of the period (in dollars per share)		$ 46.66	$ 41.62	$ 35.93
Stock options | Minimum
Common-stock based award plan
Vesting period		1 year
Stock options | Maximum
Common-stock based award plan
Vesting period		4 years
Restricted stock
Common-stock based award plan
Number of shares granted		294,000	275,000	230,000
Compensation expense (in dollars)		$ 16,093	$ 16,349	$ 15,435
Options
Granted (in shares)		294,575
Restricted stock | Minimum
Common-stock based award plan
Vesting period		3 years
Restricted stock | Maximum
Common-stock based award plan
Vesting period		6 years