BUSINESS SEGMENTS - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 549,633	$ 478,560	$ 1,060,155	$ 915,863
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	431,569		832,607
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	28,862		47,055
Canada [Member]
Disaggregation of Revenue [Line Items]
Revenue	28,886		61,862
Australia [Member]
Disaggregation of Revenue [Line Items]
Revenue	42,995		87,826
All Other Countries [Member]
Disaggregation of Revenue [Line Items]
Revenue	17,321		30,805
Home And Building Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	474,531	396,308	914,300	767,286
Home And Building Products [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	380,390		733,133
Home And Building Products [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	20,372		28,254
Home And Building Products [Member] | Canada [Member]
Disaggregation of Revenue [Line Items]
Revenue	25,828		56,175
Home And Building Products [Member] | Australia [Member]
Disaggregation of Revenue [Line Items]
Revenue	42,016		86,238
Home And Building Products [Member] | All Other Countries [Member]
Disaggregation of Revenue [Line Items]
Revenue	5,925		10,500
Home And Building Products [Member] | Residential Repair and Remodel [Member]
Disaggregation of Revenue [Line Items]
Revenue	128,711		269,236
Home And Building Products [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Revenue	162,576		275,941
Home And Building Products [Member] | Commercial Construction [Member]
Disaggregation of Revenue [Line Items]
Revenue	76,181		160,557
Home And Building Products [Member] | Residential New Construction [Member]
Disaggregation of Revenue [Line Items]
Revenue	33,892		73,716
Home And Building Products [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue	11,416		21,174
Home And Building Products [Member] | International Excluding North America [Member]
Disaggregation of Revenue [Line Items]
Revenue	61,755		113,676
Telephonics [Member]
Disaggregation of Revenue [Line Items]
Revenue	75,102	$ 82,252	145,855	$ 148,577
Telephonics [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	51,179		99,474
Telephonics [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	8,490		18,801
Telephonics [Member] | Canada [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,058		5,687
Telephonics [Member] | Australia [Member]
Disaggregation of Revenue [Line Items]
Revenue	979		1,588
Telephonics [Member] | All Other Countries [Member]
Disaggregation of Revenue [Line Items]
Revenue	11,396		20,305
Telephonics [Member] | United States Government [Member]
Disaggregation of Revenue [Line Items]
Revenue	46,376		91,936
Telephonics [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenue	23,129		45,228
Telephonics [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 5,597		$ 8,691