BUSINESS SEGMENTS - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 510,522	$ 437,303
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	401,038
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	18,193
Canada [Member]
Disaggregation of Revenue [Line Items]
Revenue	32,976
Australia [Member]
Disaggregation of Revenue [Line Items]
Revenue	44,831
All Other Countries [Member]
Disaggregation of Revenue [Line Items]
Revenue	13,484
Home And Building Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	439,769	370,978
Home And Building Products [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	352,743
Home And Building Products [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	7,882
Home And Building Products [Member] | Canada [Member]
Disaggregation of Revenue [Line Items]
Revenue	30,347
Home And Building Products [Member] | Australia [Member]
Disaggregation of Revenue [Line Items]
Revenue	44,222
Home And Building Products [Member] | All Other Countries [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,575
Home And Building Products [Member] | Residential Repair and Remodel [Member]
Disaggregation of Revenue [Line Items]
Revenue	140,525
Home And Building Products [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Revenue	113,365
Home And Building Products [Member] | Commercial Construction [Member]
Disaggregation of Revenue [Line Items]
Revenue	84,376
Home And Building Products [Member] | Residential New Construction [Member]
Disaggregation of Revenue [Line Items]
Revenue	39,824
Home And Building Products [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue	9,758
Home And Building Products [Member] | International Excluding North America [Member]
Disaggregation of Revenue [Line Items]
Revenue	51,921
Telephonics [Member]
Disaggregation of Revenue [Line Items]
Revenue	70,753	$ 66,325
Telephonics [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	48,295
Telephonics [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	10,311
Telephonics [Member] | Canada [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,629
Telephonics [Member] | Australia [Member]
Disaggregation of Revenue [Line Items]
Revenue	609
Telephonics [Member] | All Other Countries [Member]
Disaggregation of Revenue [Line Items]
Revenue	8,909
Telephonics [Member] | United States Government [Member]
Disaggregation of Revenue [Line Items]
Revenue	45,560
Telephonics [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenue	22,099
Telephonics [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 3,094