BUSINESS SEGMENTS - Revenues (Details) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment			3
Revenue	$ 566,350	$ 549,633	$ 1,114,788	$ 1,060,155
Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	274,912	287,732	515,988	504,206
Home and Building Products
Segment Reporting Information [Line Items]
Revenue	209,829	186,799	451,210	410,094
Defense Electronics
Segment Reporting Information [Line Items]
Revenue	$ 81,609	$ 75,102	$ 147,590	$ 145,855

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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