STOCK-BASED COMPENSATION (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2015 USD ($) plan $ / shares shares	Sep. 30, 2014 USD ($) $ / shares shares	Sep. 30, 2013 USD ($) $ / shares shares
Common-stock based award plan
Number of prior equity plans | plan	1
Compensation expense (in dollars) | $	$ 25,195	$ 26,703	$ 23,271
Excess tax benefit from stock-based compensation | $	$ 3,772	26,616	9,820
Stock options
Common-stock based award plan
The period from the grant date after which options expire	10 years
Compensation expense (in dollars) | $	$ 8,846	$ 11,268	$ 11,512
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)	1.70%	1.60%	0.70%
Expected stock volatility (as a percent)	36.90%	52.60%	53.90%
Dividend yield (as a percent)	3.90%	3.10%	1.10%
Expected term	5 years 6 months	5 years 6 months	5 years 6 months
Weighted-average fair value of options granted (in dollars per share) | $ / shares	$ 16.39	$ 29.44	$ 23.80
Options
Options outstanding at the beginning of the period (in shares)	2,629,000	3,991,000	4,690,000
Granted (in shares)	419,585	261,000	365,000
Exercised (in shares)	(255,000)	(1,613,000)	(1,057,000)
Forfeited/Expired (in shares)	(18,000)	(10,000)	(7,000)
Option outstanding at the end of the period (in shares)	2,776,000	2,629,000	3,991,000
Exercisable at the end of the period (in shares)	2,014,000	1,884,000	3,063,000
Shares available to grant	2,515,000	3,432,000	4,116,000
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 43.46	$ 34.12	$ 29.56
Granted (in dollars per share) | $ / shares	68.83	79.67	54.18
Exercised (in dollars per share) | $ / shares	28.46	26.08	20.68
Forfeited/Expired (in dollars per share) | $ / shares	66.78	68.82	52.32
Outstanding at the end of the period (in dollars per share) | $ / shares	48.51	43.46	34.12
Exercisable at the end of the period (in dollars per share) | $ / shares	$ 41.62	$ 35.93	$ 28.48
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	275,250	230,000	307,000
Compensation expense (in dollars) | $	$ 16,349	$ 15,435	$ 11,759
Restricted stock | Minimum
Common-stock based award plan
Vesting period	3 years
Restricted stock | Maximum
Common-stock based award plan
Vesting period	6 years