DEBT (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended			6 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012	Mar. 31, 2013 Revolving Credit Facility [Member]	Feb. 13, 2012 Former Unsecured Revolving Credit Facility [Member]	Mar. 31, 2013 Term Loan [Member]
DEBT [Abstract]
Debt Instrument, Face Amount	$ 175,000
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity				100,000	50,000
Line of Credit Facility, Additional Borrowing Capacity				75,000
Debt Instrument, Maturity Date	Feb. 13, 2017
Line of Credit Facility, Interest Rate Description				In addition to paying interest on outstanding principal under the Credit Agreement, we pay a commitment fee to the lenders under the Revolving Credit Facility in respect of the unutilized commitments thereunder at a rate ranging from 0.25% to 0.35%, based on our consolidated leverage ratio.		Borrowings under the Credit Facilities (other than in respect of swing-line loans) bear interest at a rate per annum equal to the "Applicable Rate" (as defined below) plus, at our option, either (1) a LIBOR rate determined by reference to the cost of funds for deposits in the relevant currency for the interest period relevant to such borrowing or (2) the "Base Rate", which is the highest of (x) the prime rate of Bank of America, N.A., (y) the federal funds rate plus 1/2 of 1.00% and (z) the one-month LIBOR rate plus 1.00%. The initial Applicable Rate for borrowings under the Credit Facilities was 1.75% with respect to LIBOR borrowings and 0.25% with respect to Base Rate borrowings, with such Applicable Rate subject to adjustment based on our consolidated leverage ratio. Swing-line loans will bear interest at the Base Rate plus the Applicable Rate for Base Rate loans under the Revolving Credit Facility.
Line of Credit Facility Unused Capacity Commitment Fee Percentage Minimum				0.25%
Line of Credit Facility Unused Capacity Commitment Fee Percentage Maximum				0.35%
Debt issuance costs		2,658
Debt issuance costs, current	550
Debt issuance costs, noncurrent	1,536
Debt instrument, fair value						168,438
Line of Credit Facility, Covenant Terms	The Credit Agreement contains covenants that restrict the ability of the Company and its subsidiaries to take certain actions, including, among other things and subject to certain significant exceptions: creating liens, incurring indebtedness, making investments, engaging in mergers, selling property, paying dividends or amending organizational documents. The Credit Agreement requires us to comply with certain financial ratio maintenance covenants, including a maximum consolidated leverage ratio of 3.00 to 1.00 through June 30, 2013 and a minimum consolidated fixed charge coverage ratio of 1.25 to 1.00. The maximum consolidated leverage ratio decreases to 2.75 to 1.00 between July 1, 2013 and June 30, 2014 and to 2.50 to 1.00 from July 1, 2014 through the termination of the Credit Agreement. As of March 31, 2013, our consolidated leverage ratio was 1.50 to 1.00 and our consolidated fixed charge coverage ratio was 6.61 to 1.00. The Credit Agreement also contains customary affirmative covenants and events of default. We believe we are in compliance with these covenants.
Long-term Debt, by Maturity [Abstract]
Remainder of 2013	6,563
2014	10,938
2015	15,312
2016	21,875
2017	113,750
Long Term Debt	168,438
Current portion of long-term debt	10,938		10,937
Repayment of long-term debt	$ (4,375)	$ 0