FAIR VALUE MEASUREMENTS (Summary of Financial Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016	Jul. 01, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Rabbi trust assets	$ 14,071	$ 12,637	$ 12,004
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Rabbi trust assets	14,071	12,637	12,004
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Rabbi trust assets	0	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Rabbi trust assets	$ 0	$ 0	$ 0