Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018
Segment Reporting Information [Line Items]
Net sales	$ 885,443	$ 827,665	$ 2,589,996	$ 2,175,553
Operating income for reportable segments	34,509	56,444	161,813	154,996
Assets used in business	2,322,810	2,272,323	2,322,810	2,272,323	$ 2,285,741
Depreciation and amortization of property			15,045	12,721
Capital expenditures			11,711	17,898
Service Center Based Distribution [Member]
Segment Reporting Information [Line Items]
Net sales	630,438	601,214	1,823,785	1,725,734
Operating income for reportable segments	64,763	61,076	185,889	172,965
Assets used in business	1,252,161	1,202,593	1,252,161	1,202,593
Depreciation and amortization of property	3,969	3,885	11,791	11,356
Capital expenditures	4,024	4,385	9,724	14,754
Fluid Power Businesses [Member]
Segment Reporting Information [Line Items]
Net sales	255,005	226,451	766,211	449,819
Operating income for reportable segments	25,837	26,514	85,960	53,482
Assets used in business	1,070,649	1,069,730	1,070,649	1,069,730
Depreciation and amortization of property	1,057	828	3,254	1,365
Capital expenditures	591	2,054	1,987	3,144
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	885,443	827,665	2,589,996	2,175,553
Operating income for reportable segments	90,600	87,590	$ 271,849	$ 226,447
Depreciation and amortization of property	5,026	4,713
Capital expenditures	$ 4,615	$ 6,439