BUSINESS SEGMENTS - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 574,970	$ 516,550	$ 1,635,125	$ 1,432,413
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	449,816		1,282,423
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	34,082		81,137
Canada [Member]
Disaggregation of Revenue [Line Items]
Revenue	28,968		90,830
Australia [Member]
Disaggregation of Revenue [Line Items]
Revenue	36,830		124,656
All Other Countries [Member]
Disaggregation of Revenue [Line Items]
Revenue	25,274		56,079
Home And Building Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	495,231	440,121	1,409,531	1,207,407
Home And Building Products [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	400,437		1,133,570
Home And Building Products [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	25,695		53,949
Home And Building Products [Member] | Canada [Member]
Disaggregation of Revenue [Line Items]
Revenue	26,113		82,288
Home And Building Products [Member] | Australia [Member]
Disaggregation of Revenue [Line Items]
Revenue	35,992		122,230
Home And Building Products [Member] | All Other Countries [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,994		17,494
Home And Building Products [Member] | Residential Repair and Remodel [Member]
Disaggregation of Revenue [Line Items]
Revenue	148,148		417,384
Home And Building Products [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Revenue	148,596		424,537
Home And Building Products [Member] | Commercial Construction [Member]
Disaggregation of Revenue [Line Items]
Revenue	83,382		243,939
Home And Building Products [Member] | Residential New Construction [Member]
Disaggregation of Revenue [Line Items]
Revenue	40,754		114,470
Home And Building Products [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue	12,880		34,054
Home And Building Products [Member] | International Excluding North America [Member]
Disaggregation of Revenue [Line Items]
Revenue	61,471		175,147
Telephonics [Member]
Disaggregation of Revenue [Line Items]
Revenue	79,739	$ 76,429	225,594	$ 225,006
Telephonics [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	49,379		148,853
Telephonics [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	8,387		27,188
Telephonics [Member] | Canada [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,855		8,542
Telephonics [Member] | Australia [Member]
Disaggregation of Revenue [Line Items]
Revenue	838		2,426
Telephonics [Member] | All Other Countries [Member]
Disaggregation of Revenue [Line Items]
Revenue	18,280		38,585
Telephonics [Member] | United States Government [Member]
Disaggregation of Revenue [Line Items]
Revenue	46,579		138,515
Telephonics [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenue	30,120		75,348
Telephonics [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 3,040		$ 11,731