WARRANTY LIABILITY - Narrative (Details)	3 Months Ended
	Dec. 31, 2019
Defense Electronics | Minimum
Product Warranty Liability [Line Items]
Product warranty period	1 year
Defense Electronics | Maximum
Product Warranty Liability [Line Items]
Product warranty period	2 years
HBP | Minimum
Product Warranty Liability [Line Items]
Product warranty period	1 year
HBP | Maximum
Product Warranty Liability [Line Items]
Product warranty period	10 years
CPP
Product Warranty Liability [Line Items]
Product warranty period	90 days