Revenue Recognition Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 3,245,652	$ 3,472,739	$ 3,073,274
UNITED STATES
Disaggregation of Revenue [Line Items]
Net sales	2,819,400	3,016,759	2,615,041
CANADA
Disaggregation of Revenue [Line Items]
Net sales	248,610	271,305	273,622
Other Countries [Member]
Disaggregation of Revenue [Line Items]
Net sales	177,642	184,675	184,611
Service Center Based Distribution Segment [Member]
Disaggregation of Revenue [Line Items]
Net sales	2,241,949	2,452,905	2,346,418
Service Center Based Distribution Segment [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Net sales	1,833,275	2,009,479	1,903,388
Service Center Based Distribution Segment [Member] | CANADA
Disaggregation of Revenue [Line Items]
Net sales	248,610	271,305	273,622
Service Center Based Distribution Segment [Member] | Other Countries [Member]
Disaggregation of Revenue [Line Items]
Net sales	160,064	172,121	169,408
Fluid Power & Flow Control Segment [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,003,703	1,019,834	726,856
Fluid Power & Flow Control Segment [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Net sales	986,125	1,007,280	711,653
Fluid Power & Flow Control Segment [Member] | CANADA
Disaggregation of Revenue [Line Items]
Net sales	0	0	0
Fluid Power & Flow Control Segment [Member] | Other Countries [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 17,578	$ 12,554	$ 15,203