Revenue Recognition Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 833,375	$ 840,038	$ 1,689,779	$ 1,704,553
UNITED STATES
Disaggregation of Revenue [Line Items]
Net sales	720,340	727,197	1,463,326	1,474,620
CANADA
Disaggregation of Revenue [Line Items]
Net sales	67,897	68,569	133,843	137,676
Other Countries [Member]
Disaggregation of Revenue [Line Items]
Net sales	45,138	44,272	92,610	92,257
Service Center Based Distribution Segment [Member]
Disaggregation of Revenue [Line Items]
Net sales	575,788	589,298	1,178,948	1,193,347
Service Center Based Distribution Segment [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Net sales	467,191	479,335	960,064	970,109
Service Center Based Distribution Segment [Member] | CANADA
Disaggregation of Revenue [Line Items]
Net sales	67,897	68,569	133,843	137,676
Service Center Based Distribution Segment [Member] | Other Countries [Member]
Disaggregation of Revenue [Line Items]
Net sales	40,700	41,394	85,041	85,562
Fluid Power & Flow Control Segment [Member]
Disaggregation of Revenue [Line Items]
Net sales	257,587	250,740	510,831	511,206
Fluid Power & Flow Control Segment [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Net sales	253,149	247,862	503,262	504,511
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	$ 4,438	$ 2,878	$ 7,569	$ 6,695