REVENUE RECOGNITION - Schedule of Revenue by Reportable Segment and Major Customer Industry (Details)	12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024
General Industry
Disaggregation of Revenue [Line Items]
Total	38.10%	36.40%	36.20%
Industrial Machinery
Disaggregation of Revenue [Line Items]
Total	14.30%	13.30%	13.30%
Food
Disaggregation of Revenue [Line Items]
Total	10.90%	11.30%	11.10%
Metals
Disaggregation of Revenue [Line Items]
Total	9.90%	9.80%	10.00%
Forest Products
Disaggregation of Revenue [Line Items]
Total	8.20%	9.10%	9.20%
Chem/Petrochem
Disaggregation of Revenue [Line Items]
Total	5.60%	6.80%	6.90%
Cement & Aggregate
Disaggregation of Revenue [Line Items]
Total	5.30%	5.30%	5.50%
Transportation
Disaggregation of Revenue [Line Items]
Total	3.90%	4.10%	3.80%
Oil & Gas
Disaggregation of Revenue [Line Items]
Total	3.80%	3.90%	4.00%
Total
Disaggregation of Revenue [Line Items]
Total	100.00%	100.00%	100.00%
Service Center \| General Industry
Disaggregation of Revenue [Line Items]
Total	34.80%	34.50%	35.00%
Service Center \| Industrial Machinery
Disaggregation of Revenue [Line Items]
Total	8.10%	8.30%	8.20%
Service Center \| Food
Disaggregation of Revenue [Line Items]
Total	15.40%	15.40%	15.00%
Service Center \| Metals
Disaggregation of Revenue [Line Items]
Total	11.80%	11.00%	10.90%
Service Center \| Forest Products
Disaggregation of Revenue [Line Items]
Total	11.70%	12.20%	12.00%
Service Center \| Chem/Petrochem
Disaggregation of Revenue [Line Items]
Total	2.50%	2.80%	2.70%
Service Center \| Cement & Aggregate
Disaggregation of Revenue [Line Items]
Total	7.40%	7.30%	7.40%
Service Center \| Transportation
Disaggregation of Revenue [Line Items]
Total	3.50%	3.60%	3.70%
Service Center \| Oil & Gas
Disaggregation of Revenue [Line Items]
Total	4.80%	4.90%	5.10%
Service Center \| Total
Disaggregation of Revenue [Line Items]
Total	100.00%	100.00%	100.00%
Engineered Solutions \| General Industry
Disaggregation of Revenue [Line Items]
Total	44.30%	40.00%	38.70%
Engineered Solutions \| Industrial Machinery
Disaggregation of Revenue [Line Items]
Total	25.50%	23.30%	24.20%
Engineered Solutions \| Food
Disaggregation of Revenue [Line Items]
Total	2.80%	3.20%	2.80%
Engineered Solutions \| Metals
Disaggregation of Revenue [Line Items]
Total	6.70%	7.30%	7.90%
Engineered Solutions \| Forest Products
Disaggregation of Revenue [Line Items]
Total	1.90%	3.20%	3.20%
Engineered Solutions \| Chem/Petrochem
Disaggregation of Revenue [Line Items]
Total	11.10%	14.60%	16.00%
Engineered Solutions \| Cement & Aggregate
Disaggregation of Revenue [Line Items]
Total	1.30%	1.40%	1.30%
Engineered Solutions \| Transportation
Disaggregation of Revenue [Line Items]
Total	4.50%	4.90%	4.20%
Engineered Solutions \| Oil & Gas
Disaggregation of Revenue [Line Items]
Total	1.90%	2.10%	1.70%
Engineered Solutions \| Total
Disaggregation of Revenue [Line Items]
Total	100.00%	100.00%	100.00%