DEBT (Details) - USD ($) $ in Thousands			12 Months Ended
	Jun. 27, 2014	Jun. 26, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Feb. 13, 2012
Debt Instrument [Line Items]
Total outstanding commitments			$ 164,063
Debt issuance costs			0	$ 550	$ 0	$ 2,658
Debt issuance costs, current			410
Debt issuance costs, noncurrent			$ 1,075
Weighted average fixed rate (in hundredths)			1.50%
Conversion Percentage of Variable Rate Debt into Fixed Debt Rate			50.00%
Current portion of long-term debt			$ 8,750	$ 8,750
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. These include a maximum consolidated leverage ratio of 3.00 to 1.00 through December 31, 2015 and a minimum consolidated fixed charge coverage ratio of 1.25 to 1.00. The maximum consolidated leverage ratio will decrease to 2.75 to 1.00 from January 1, 2016 through the termination of the Credit Agreement. As of September 30, 2015, our consolidated leverage ratio was 1.52 to 1.00 and our consolidated fixed charge coverage ratio was 5.54 to 1.00. The Credit Agreement also contains customary affirmative covenants and events of default. We believe we are in compliance with these covenants.
Consolidated leverage ratio through December 31, 2015			3.00
Consolidated fixed charge coverage ratio			1.25
Consolidated leverage ratio after January 1, 2016			2.75
Actual consolidated leverage ratio			1.52
Actual consolidated fixed charge coverage			5.54
Long-term Debt, by Maturity [Abstract]
2016			$ 8,750
2017			7,656
2018			14,219
2019			133,438
Long Term Debt			$ 164,063
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity	$ 200,000	$ 175,000					$ 175,000
Debt instrument, maturity date	Jun. 27, 2019	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. As amended, the fee ranges from 0.20% to 0.30%, based on our consolidated leverage ratio.
Line of credit facility unused capacity commitment fee percentage, minimum (in hundredths)			0.20%
Line of credit facility unused capacity commitment fee percentage, maximum (in hundredths)			0.30%
Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 175,000	$ 157,500					$ 175,000
Increase in loan commitments	17,500
Amount drawn from increase in loan commitments	17,500
Total outstanding commitments	175,000
Line of credit facility, interest rate description			Borrowings under the amended 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 current Applicable Rate for borrowings under the Credit Facilities is 1.50%, as amended, 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 bear interest at the Base Rate plus the Applicable Rate for Base Rate loans under the Revolving Credit Facility.
Current portion of long-term debt			$ 8,750
Long-term Debt, by Maturity [Abstract]
Long Term Debt	$ 175,000