Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019
Segment Reporting Information [Line Items]
Net sales	$ 830,797	$ 885,443	$ 2,520,576	$ 2,589,996
Operating income for reportable segments	(77,950)	34,509	41,961	161,813
Assets used in business	2,289,529		2,289,529		$ 2,331,697
Depreciation and amortization of property			15,997	15,045
Capital expenditures			16,223	11,711
Service Center Based Distribution [Member]
Segment Reporting Information [Line Items]
Net sales	574,368	630,438	1,753,316	1,823,785
Operating income for reportable segments	53,014	64,763	167,279	185,889
Assets used in business	1,310,754	1,252,161	1,310,754	1,252,161
Depreciation and amortization of property	4,373	3,969	12,831	11,791
Capital expenditures	3,588	4,024	14,022	9,724
Fluid Power & Flow Control Segment [Member]
Segment Reporting Information [Line Items]
Net sales	256,429	255,005	767,260	766,211
Operating income for reportable segments	26,449	25,837	82,755	85,960
Assets used in business	978,775	1,070,649	978,775	1,070,649
Depreciation and amortization of property	1,007	1,057	3,166	3,254
Capital expenditures	670	591	2,201	1,987
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	830,797	885,443	2,520,576	2,589,996
Operating income for reportable segments	79,463	90,600	250,034	271,849
Assets used in business	2,289,529	2,322,810	2,289,529	2,322,810
Depreciation and amortization of property	5,380	5,026	15,997	15,045
Capital expenditures	$ 4,258	$ 4,615	$ 16,223	$ 11,711