REVENUE RECOGNITION - Impact of Topic 606 on Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 28, 2018	Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unbilled contract revenue	$ 6,103	$ 0
Inventories	37,214	34,126
Deferred income taxes	8,419	8,855
Accumulated deficit	(18,950)	$ (20,463)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unbilled contract revenue	0
Inventories	42,281
Deferred income taxes	8,647
Accumulated deficit	(19,758)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] \| ASC 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unbilled contract revenue	6,103
Inventories	(5,067)
Deferred income taxes	(228)
Accumulated deficit	$ 808

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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