Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Segment financial information
Net sales	$ 3,472,739	$ 3,073,274	$ 2,593,746
Operating income for reportable segments	233,788	225,827	175,386
Assets used in the business	2,331,697	2,285,741
Depreciation and amortization of property	20,236	17,798	15,306
Capital expenditures	18,970	23,230	17,045
Service Center Based Distribution Segment [Member]
Segment financial information
Net sales	2,452,905	2,346,418	2,180,358
Operating income for reportable segments	254,954	238,322	203,267
Assets used in the business	1,265,093	1,198,296	1,187,054
Depreciation and amortization of property	15,982	15,336	14,375
Capital expenditures	16,475	18,492	14,566
Fluid Power & Flow Control Segment [Member]
Segment financial information
Net sales	1,019,834	726,856	413,388
Operating income for reportable segments	112,117	83,175	46,312
Assets used in the business	1,066,604	1,087,445	200,541
Depreciation and amortization of property	4,254	2,462	931
Capital expenditures	2,495	4,738	2,479
Reportable Segment [Member]
Segment financial information
Net sales	3,472,739	3,073,274	2,593,746
Operating income for reportable segments	367,071	321,497	249,579
Assets used in the business	2,331,697	2,285,741	1,387,595
Depreciation and amortization of property	20,236	17,798	15,306
Capital expenditures	$ 18,970	$ 23,230	$ 17,045