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INCOME TAXES - ADDITIONAL INFORMATION (Details) - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Oct. 01, 2017
Income Taxes [Line Items]
Blended tax rate	24.30%
Reduction in net deferred tax asset balance	$ 4,900,000
Net change increase (decrease) in total valuation allowance	400,000	$ (10,100,000)
Investment credit carryforwards	$ 3,890,000	3,171,000
Research and development credits expiry period beginning year	2022
Research and development credit carryforwards	$ 1,900,000
Unrecognized tax benefits that will impact the company's effective tax rate	1,300,000
Accrued interest or penalties	0
ASU 2016-09
Income Taxes [Line Items]
Cumulative-effect adjustment from the adoption of ASU 2016-09		8,255,000
Retained Earnings | ASU 2016-09
Income Taxes [Line Items]
Cumulative-effect adjustment from the adoption of ASU 2016-09		$ 8,255,000	$ 8,300,000
Research and development credit
Income Taxes [Line Items]
Investment credit carryforwards	2,200,000
Federal
Income Taxes [Line Items]
Net operating loss carryforwards	$ 27,600,000
Operating loss carryforwards, expiration start year	2032
State
Income Taxes [Line Items]
Net operating loss carryforwards	$ 30,200,000
Net operating loss carryforwards will begin to expire	2028

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