Segment Information (Details) - USD ($)	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020
Segment Reporting Information [Line Items]
Net sales	$ 747,807,000	$ 856,404,000
Operating income for reportable segments	52,308,000	61,166,000
Assets used in business	2,249,253,000	2,429,732,000	$ 2,283,551,000
Depreciation and amortization of property	5,352,000	5,223,000
Capital expenditures	3,597,000	4,946,000
Service Center Based Distribution Segment [Member]
Segment Reporting Information [Line Items]
Net sales	513,284,000	603,160,000
Operating income for reportable segments	49,901,000	60,360,000
Assets used in business	1,283,031,000	1,289,592,000
Depreciation and amortization of property	4,395,000	4,178,000
Capital expenditures	3,088,000	4,195,000
Fluid Power & Flow Control Segment [Member]
Segment Reporting Information [Line Items]
Net sales	234,523,000	253,244,000
Operating income for reportable segments	25,861,000	26,857,000
Assets used in business	966,222,000	1,140,140,000
Depreciation and amortization of property	957,000	1,045,000
Capital expenditures	509,000	751,000
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	747,807,000	856,404,000
Operating income for reportable segments	75,762,000	87,217,000
Depreciation and amortization of property	5,352,000	5,223,000
Capital expenditures	$ 3,597,000	$ 4,946,000