REPORTABLE SEGMENTS REPORTABLE SEGMENTS (Details) - Schedule of Disaggregated Revenue by Segment $ in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 CAD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 CAD ($)	Sep. 30, 2017 USD ($)
Segment Reporting Information [Line Items]
Revenue	$ 2,209,289	$ 3,500	$ 1,977,918	$ 700	$ 1,524,997
Consumer And Professional Products Segment [Member]
Segment Reporting Information [Line Items]
Revenue	1,000,608
Home and Building Products (HBP) [Member]
Segment Reporting Information [Line Items]
Revenue	873,640
Defense Electronics Segment [Member]
Segment Reporting Information [Line Items]
Revenue	335,041
Residential Repair and Remodel [Member] | Consumer And Professional Products Segment [Member]
Segment Reporting Information [Line Items]
Revenue	140,369
Residential Repair and Remodel [Member] | Home and Building Products (HBP) [Member]
Segment Reporting Information [Line Items]
Revenue	439,287
Retail [Member] | Consumer And Professional Products Segment [Member]
Segment Reporting Information [Line Items]
Revenue	528,279
Commercial Construction [Member] | Home and Building Products (HBP) [Member]
Segment Reporting Information [Line Items]
Revenue	335,339
Residential New Construction [Member] | Consumer And Professional Products Segment [Member]
Segment Reporting Information [Line Items]
Revenue	58,709
Residential New Construction [Member] | Home and Building Products (HBP) [Member]
Segment Reporting Information [Line Items]
Revenue	99,014
Industrial [Member] | Consumer And Professional Products Segment [Member]
Segment Reporting Information [Line Items]
Revenue	45,129
International Excluding North America [Member] | Consumer And Professional Products Segment [Member]
Segment Reporting Information [Line Items]
Revenue	228,122
United States Government [Member] | Defense Electronics Segment [Member]
Segment Reporting Information [Line Items]
Revenue	211,405
International [Member] | Defense Electronics Segment [Member]
Segment Reporting Information [Line Items]
Revenue	105,705
Commercial [Member] | Defense Electronics Segment [Member]
Segment Reporting Information [Line Items]
Revenue	$ 17,931