STOCKHOLDERS' EQUITY AND EQUITY COMPENSATION (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended
	Aug. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
STOCKHOLDERS' EQUITY AND EQUITY COMPENSATION (Details) [Line Items]
Payments of Dividends		$ 5,825	$ 4,743	$ 0
Common Stock, Dividends, Per Share, Cash Paid (in Dollars per share)		$ 0.10	$ 0.08
Share-based Compensation Arrangement by Share-based Payment Award, Description		Options granted under the Incentive Plan may be either "incentive stock options" or nonqualified stock options, generally expire ten years after the date of grant and are granted at an exercise price of not less than 100% of the fair market value at the date of grant.
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		10 years
Maximum Percentage of Exercise Price at Grand Date Fair Value		100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)		4,815,235
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value				270
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options		15,275
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		1 year 146 days
Share-based Compensation		12,495	10,439	8,956
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense		3,068	2,547	2,598
Stock Repurchase Program, Authorized Amount	50,000
Common Stock Authorized For Repurchase Under Existing Buyback Program (in Shares)	1,366,000
Stock Repurchased During Period, Shares (in Shares)		2,369,786	1,187,066	1,531,379
Stock Repurchased During Period, Value		26,285	10,379	12,367
Stock Repurchased During Period Per Share (in Dollars per share)		$ 11.09	$ 8.74	$ 8.08
Stock Repurchase Program, Remaining Authorized Repurchase Amount		12,027	38,312	48,690
Shares Paid for Tax Withholding for Share Based Compensation (in Shares)		536,183
Shares Paid For Tax Withholding For Share Based Compensation, Value		$ 6,236
Shares Paid For Tax Withholding For Share Based Compensation, Value Per Share (in Dollars per share)		$ 11.63
Incentive Plan [Member]
STOCKHOLDERS' EQUITY AND EQUITY COMPENSATION (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)		3,000,000
Incentive Stock Options [Member]
STOCKHOLDERS' EQUITY AND EQUITY COMPENSATION (Details) [Line Items]
Stock Issued During Period, Shares, New Issues (in Shares)		600,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)		672,332
Two Thousand Six Equity Incentive Plan [Member]
STOCKHOLDERS' EQUITY AND EQUITY COMPENSATION (Details) [Line Items]
Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Additional Grants in Future (in Shares)		0
Restricted Stock [Member]
STOCKHOLDERS' EQUITY AND EQUITY COMPENSATION (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)		1,225,285	439,500	1,415,700
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years	3 years
Performance Shares [Member]
STOCKHOLDERS' EQUITY AND EQUITY COMPENSATION (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)		1,146,892	268,000