Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018
Segment Reporting Information [Line Items]
Net Sales	$ 864,515	$ 680,701
Segment financial information
Operating income for reportable segments	66,339	51,837
Assets used in business	2,305,688		$ 2,285,741
Depreciation and amortization of property	4,981	3,927
Capital expenditures	3,173	6,336
Service Center Based Distribution [Member]
Segment Reporting Information [Line Items]
Net Sales	604,049	568,913
Segment financial information
Operating income for reportable segments	62,809	59,247
Assets used in business	1,227,815	1,182,784
Depreciation and amortization of property	3,911	3,669
Capital expenditures	2,444	5,548
Fluid Power Businesses [Member]
Segment Reporting Information [Line Items]
Net Sales	260,466	111,788
Segment financial information
Operating income for reportable segments	30,880	13,202
Assets used in business	1,077,873	202,123
Depreciation and amortization of property	1,070	258
Capital expenditures	729	788
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Sales	864,515	680,701
Segment financial information
Operating income for reportable segments	93,689	72,449
Assets used in business	2,305,688	1,384,907
Depreciation and amortization of property	4,981	3,927
Capital expenditures	$ 3,173	$ 6,336