Revenue Recognition Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 830,797	$ 885,443	$ 2,520,576	$ 2,589,996
UNITED STATES
Disaggregation of Revenue [Line Items]
Net sales	724,982	772,102	2,188,308	2,246,722
CANADA
Disaggregation of Revenue [Line Items]
Net sales	59,912	66,725	193,755	204,401
Other Countries [Member]
Disaggregation of Revenue [Line Items]
Net sales	45,903	46,616	138,513	138,873
Service Center Based Distribution Segment [Member]
Disaggregation of Revenue [Line Items]
Net sales	574,368	630,438	1,753,316	1,823,785
Service Center Based Distribution Segment [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Net sales	473,069	520,180	1,433,133	1,490,289
Service Center Based Distribution Segment [Member] | CANADA
Disaggregation of Revenue [Line Items]
Net sales	59,912	66,725	193,755	204,401
Service Center Based Distribution Segment [Member] | Other Countries [Member]
Disaggregation of Revenue [Line Items]
Net sales	41,387	43,533	126,428	129,095
Fluid Power & Flow Control Segment [Member]
Disaggregation of Revenue [Line Items]
Net sales	256,429	255,005	767,260	766,211
Fluid Power & Flow Control Segment [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Net sales	251,913	251,922	755,175	756,433
Fluid Power & Flow Control Segment [Member] | CANADA
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Fluid Power & Flow Control Segment [Member] | Other Countries [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 4,516	$ 3,083	$ 12,085	$ 9,778