DEBT (Details) - USD ($) $ in Thousands			3 Months Ended	9 Months Ended
	Jun. 27, 2014	Jun. 26, 2014	Jun. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Feb. 13, 2012
Long-term Debt [Abstract]
Long-term debt, prepaid debt issuance cost			$ 0	$ 0		$ 441
Gain on termination of interest rate swaps			532
Current portion of long-term debt			$ 0	$ 0		10,938
Credit Agreement [Member] | Revolving Credit Facility [Member]
Long-term Debt [Abstract]
Line of credit facility, borrowing capacity		$ 75,000
Maturity date of credit facility		Feb. 13, 2017
Credit Agreement [Member] | Term Loan [Member]
Long-term Debt [Abstract]
Face amount of debt		$ 157,500					$ 175,000
Amended Credit Agreement [Member]
Long-term Debt [Abstract]
Interest rate description				borrowings under the amended Credit Facilities (other than in respect of swing-line loans) would 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 amended Credit Facilities is 1.50%, 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.
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 2.75 to 1.00 and a minimum consolidated fixed charge coverage ratio of 1.25 to 1.00 for the period January 1, 2016 through the expiration of the Credit Agreement. As of June 30, 2017, our consolidated leverage ratio was 0.00 to 1.00 and our consolidated fixed charge coverage ratio was 3.74 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			0	0
Consolidated fixed charge coverage ratio			3.74	3.74
Amended Credit Agreement [Member] | Minimum [Member]
Long-term Debt [Abstract]
Consolidated fixed charge coverage ratio			1.25	1.25
Amended Credit Agreement [Member] | Maximum [Member]
Long-term Debt [Abstract]
Consolidated leverage ratio			2.75	2.75
Amended Credit Agreement [Member] | Federal Funds Rate [Member]
Long-term Debt [Abstract]
Term of variable rate				1 month
Basis spread on variable rate				0.50%
Amended Credit Agreement [Member] | LIBOR [Member]
Long-term Debt [Abstract]
Basis spread on variable rate				1.00%
Current applicable rate			1.50%	1.50%
Amended Credit Agreement [Member] | Base Rate [Member]
Long-term Debt [Abstract]
Current applicable rate			0.25%	0.25%
Amended Credit Agreement [Member] | Revolving Credit Facility [Member]
Long-term Debt [Abstract]
Line of credit facility, borrowing capacity			$ 100,000	$ 100,000
Maturity date of credit facility				Jun. 27, 2019
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.
Amended Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Long-term Debt [Abstract]
Commitment fee percentage				0.20%
Amended Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Long-term Debt [Abstract]
Commitment fee percentage				0.30%
Amended Credit Agreement [Member] | Term Loan [Member]
Long-term Debt [Abstract]
Increase in loan commitments	$ 17,500
Amount drawn from increase in loan commitments	17,500
Term loan commitments outstanding	$ 175,000
Long-term debt, prepaid debt issuance cost					$ 315	$ 441