REPORTABLE SEGMENTS - Narrative (Details) - segment	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Number of reportable segments	2
Segment Revenue Benchmark | Home Depot | Consumer and Professional Products | Customer Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	26.00%	27.00%	28.00%
Segment Revenue Benchmark | Home Depot | Home and Building Products | Customer Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	10.00%	12.00%	13.00%
Consolidated Revenue from Continuing Operations Benchmark | Home Depot | Consumer and Professional Products | Customer Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	14.00%	13.00%	13.00%
Consolidated Revenue from Continuing Operations Benchmark | Home Depot | Home and Building Products | Customer Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	5.00%	5.00%	5.00%