Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Segment financial information
Net sales	$ 3,245,652	$ 3,472,739	$ 3,073,274
Operating income for reportable segments	88,989	233,788	225,827
Assets used in the business	2,283,551	2,331,697
Depreciation and amortization of property	21,196	20,236	17,798
Capital expenditures	20,115	18,970	23,230
Service Center Based Distribution Segment [Member]
Segment financial information
Net sales	2,241,949	2,452,905	2,346,418
Operating income for reportable segments	211,667	254,954	238,322
Assets used in the business	1,314,011	1,265,093	1,198,296
Depreciation and amortization of property	17,133	15,982	15,336
Capital expenditures	17,063	16,475	18,492
Fluid Power & Flow Control Segment [Member]
Segment financial information
Net sales	1,003,703	1,019,834	726,856
Operating income for reportable segments	109,847	112,117	83,175
Assets used in the business	969,540	1,066,604	1,087,445
Depreciation and amortization of property	4,063	4,254	2,462
Capital expenditures	3,052	2,495	4,738
Reportable Segment [Member]
Segment financial information
Net sales	3,245,652	3,472,739	3,073,274
Operating income for reportable segments	321,514	367,071	321,497
Assets used in the business	2,283,551	2,331,697	2,285,741
Depreciation and amortization of property	21,196	20,236	17,798
Capital expenditures	$ 20,115	$ 18,970	$ 23,230