Revenue Recognition Revenue Recognition (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 3,472,739	$ 3,073,274	$ 2,593,746
UNITED STATES
Disaggregation of Revenue [Line Items]
Net sales	3,016,759	2,615,041
CANADA
Disaggregation of Revenue [Line Items]
Net sales	271,305	273,622
Other Countries [Member]
Disaggregation of Revenue [Line Items]
Net sales	184,675	184,611
Service Center Based Distribution Segment [Member]
Disaggregation of Revenue [Line Items]
Net sales	2,452,905	2,346,418	2,180,358
Service Center Based Distribution Segment [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Net sales	2,009,479	1,903,388
Service Center Based Distribution Segment [Member] | CANADA
Disaggregation of Revenue [Line Items]
Net sales	271,305	273,622
Service Center Based Distribution Segment [Member] | Other Countries [Member]
Disaggregation of Revenue [Line Items]
Net sales	172,121	169,408
Fluid Power & Flow Control Segment [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,019,834	726,856	$ 413,388
Fluid Power & Flow Control Segment [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Net sales	1,007,280	711,653
Fluid Power & Flow Control Segment [Member] | CANADA
Disaggregation of Revenue [Line Items]
Net sales	0	0
Fluid Power & Flow Control Segment [Member] | Other Countries [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 12,554	$ 15,203