GOODWILL AND INTANGIBLES- Schedule of changes in the carrying amount of goodwill by reportable segment (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2025	Jun. 30, 2025
Changes in the carrying amount of goodwill by reportable segment
Balance at beginning of period	$ 699,374	$ 619,395
Goodwill acquired	788	80,109
Other, primarily currency translation	(300)	(130)
Balance at ending of period	699,862	699,374
Service Center
Changes in the carrying amount of goodwill by reportable segment
Balance at beginning of period	221,706	219,574
Goodwill acquired	507	2,262
Other, primarily currency translation	(300)	(130)
Balance at ending of period	221,913	221,706
Engineered Solutions
Changes in the carrying amount of goodwill by reportable segment
Balance at beginning of period	477,668	399,821
Goodwill acquired	281	77,847
Other, primarily currency translation	0	0
Balance at ending of period	$ 477,949	$ 477,668