Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2019
Segment Reporting Information [Line Items]
Net sales	$ 833,375	$ 840,038	$ 1,689,779	$ 1,704,553
Operating income for reportable segments	58,745	60,965	119,911	127,304
Assets used in business	2,418,997		2,418,997		$ 2,331,697
Depreciation and amortization of property			10,617	10,019
Capital expenditures			11,965	7,096
Service Center Based Distribution [Member]
Segment Reporting Information [Line Items]
Net sales	575,788	589,298	1,178,948	1,193,347
Operating income for reportable segments	53,905	58,317	114,265	121,126
Assets used in business	1,291,399	1,223,926	1,291,399	1,223,926
Depreciation and amortization of property	4,280	3,911	8,458	7,822
Capital expenditures	6,239	3,256	10,434	5,700
Fluid Power & Flow Control Segment [Member]
Segment Reporting Information [Line Items]
Net sales	257,587	250,740	510,831	511,206
Operating income for reportable segments	29,449	29,243	56,306	60,123
Assets used in business	1,127,598	1,066,062	1,127,598	1,066,062
Depreciation and amortization of property	1,114	1,127	2,159	2,197
Capital expenditures	780	667	1,531	1,396
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	833,375	840,038	1,689,779	1,704,553
Operating income for reportable segments	83,354	87,560	170,571	181,249
Assets used in business	2,418,997	2,289,988	2,418,997	2,289,988
Depreciation and amortization of property	5,394	5,038	10,617	10,019
Capital expenditures	$ 7,019	$ 3,923	$ 11,965	$ 7,096