REVENUE - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Oct. 01, 2018	Sep. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percentage of performance obligations recognized at a point in time (more than)		80.00%
Percentage of performance obligations recognized over time (less than)		20.00%
Favorable (unfavorable) catch-up adjustments to income from operations		$ (2,500)	$ 500
Accumulated estimated costs to complete loss contracts		9,700			$ 12,200
Contract costs and recognized income not yet billed, net of progress payments, current		89,232		$ 100,821	121,803
Decrease in contract assets balance		32,571
Contract costs and recognized income not yet billed, net of progress payments, noncurrent		31,400			29,500
Unbilled receivable reserve		793			400
Billings in excess of costs		29,113		25,841
Increase in billings in excess of costs		11,554
Accounting Standards Update 2014-09 (ASC 606) [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect adjustment for new accounting pronouncement	[1]				5,673
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract costs and recognized income not yet billed, net of progress payments, current		105,608			121,803
Billings in excess of costs		$ 20,831			17,559
Retained Earnings [Member] | Accounting Standards Update 2014-09 (ASC 606) [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect adjustment for new accounting pronouncement	[1]			$ 5,673	$ 5,673
Minimum [Member] | Home And Building Products [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Payment term		15 days
Maximum [Member] | Home And Building Products [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Payment term		90 days

[1] See Note 14 - Recent Accounting Pronouncements and Note 3 - Revenue for additional information.