Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019
Segment Reporting Information [Line Items]
Net sales	$ 856,404	$ 864,515
Operating income for reportable segments	61,166	66,339
Assets used in business	2,429,732		$ 2,331,697
Depreciation and amortization of property	5,223	4,981
Capital expenditures	4,946	3,173
Service Center Based Distribution [Member]
Segment Reporting Information [Line Items]
Net sales	603,160	604,049
Operating income for reportable segments	60,360	62,809
Assets used in business	1,289,592	1,227,815
Depreciation and amortization of property	4,178	3,911
Capital expenditures	4,195	2,444
Fluid Power & Flow Control Segment [Member]
Segment Reporting Information [Line Items]
Net sales	253,244	260,466
Operating income for reportable segments	26,857	30,880
Assets used in business	1,140,140	1,077,873
Depreciation and amortization of property	1,045	1,070
Capital expenditures	751	729
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	856,404	864,515
Operating income for reportable segments	87,217	93,689
Assets used in business	2,429,732	2,305,688
Depreciation and amortization of property	5,223	4,981
Capital expenditures	$ 4,946	$ 3,173