DEBT (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Debt Instrument [Line Items]
Debt issuance costs	$ 2,658
Debt issuance costs, current	537
Debt issuance costs, noncurrent	1,800
Debt instrument, fair value	172,812
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. As of September 30, 2012, our consolidated leverage ratio was 1.60 to 1.00 and our consolidated fixed charge coverage ratio was 10.93 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]
2013	10,937
2014	10,938
2015	15,312
2016	21,875
2017	113,750
Long Term Debt	172,812
Current portion of long-term debt	10,937	0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Potential maximum borrowing capacity	100,000
Line of Credit Facility, Additional Borrowing Capacity	75,000
Debt Instrument, Maturity Date	Feb. 13, 2017
Line of Credit Facility, Interest Rate Description	Swing-line loans will bear interest at the Base Rate plus the Applicable Rate for Base Rate loans under the Revolving Credit Facility. In addition to paying interest on outstanding principal under the Credit Agreement, we will 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.
Line of Credit Facility Unused Capacity Commitment Fee Percentage Minimum	0.25%
Line of Credit Facility Unused Capacity Commitment Fee Percentage Maximum	0.35%
Term Loan [Member]
Debt Instrument [Line Items]
Potential maximum borrowing capacity	$ 175,000
Debt Instrument, Maturity Date	Feb. 13, 2017
Line of Credit Facility, Interest Rate Description	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.