REPORTABLE SEGMENTS - Schedule of Disaggregated Revenue by End Market and Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Disaggregation of Revenue [Line Items]
Total Consolidated Revenue	$ 649,088	$ 632,371
Home and Building Products
Disaggregation of Revenue [Line Items]
Total Consolidated Revenue	408,004	395,401
Consumer and Professional Products
Disaggregation of Revenue [Line Items]
Total Consolidated Revenue	241,084	236,970
Residential repair and remodel | Home and Building Products
Disaggregation of Revenue [Line Items]
Total Consolidated Revenue	202,111	194,682
Residential repair and remodel | Consumer and Professional Products
Disaggregation of Revenue [Line Items]
Total Consolidated Revenue	68,202	70,259
Commercial | Home and Building Products
Disaggregation of Revenue [Line Items]
Total Consolidated Revenue	173,414	166,867
Residential new construction | Home and Building Products
Disaggregation of Revenue [Line Items]
Total Consolidated Revenue	32,479	33,852
Residential new construction | Consumer and Professional Products
Disaggregation of Revenue [Line Items]
Total Consolidated Revenue	13,678	14,381
Retail | Consumer and Professional Products
Disaggregation of Revenue [Line Items]
Total Consolidated Revenue	47,340	47,263
Industrial | Consumer and Professional Products
Disaggregation of Revenue [Line Items]
Total Consolidated Revenue	14,066	13,854
International excluding North America | Consumer and Professional Products
Disaggregation of Revenue [Line Items]
Total Consolidated Revenue	$ 97,798	$ 91,213