Revenue Recognition Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 751,287	$ 833,375	$ 1,499,094	$ 1,689,779
UNITED STATES
Disaggregation of Revenue [Line Items]
Net sales	647,814	720,340	1,291,871	1,463,326
CANADA
Disaggregation of Revenue [Line Items]
Net sales	57,809	67,897	114,705	133,843
Other Countries [Member]
Disaggregation of Revenue [Line Items]
Net sales	45,664	45,138	92,518	92,610
Service Center Based Distribution Segment [Member]
Disaggregation of Revenue [Line Items]
Net sales	515,690	575,788	1,028,974	1,178,948
Service Center Based Distribution Segment [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Net sales	417,456	467,191	832,698	960,064
Service Center Based Distribution Segment [Member] | CANADA
Disaggregation of Revenue [Line Items]
Net sales	57,809	67,897	114,705	133,843
Service Center Based Distribution Segment [Member] | Other Countries [Member]
Disaggregation of Revenue [Line Items]
Net sales	40,425	40,700	81,571	85,041
Fluid Power & Flow Control Segment [Member]
Disaggregation of Revenue [Line Items]
Net sales	235,597	257,587	470,120	510,831
Fluid Power & Flow Control Segment [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Net sales	230,358	253,149	459,173	503,262
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	$ 5,239	$ 4,438	$ 10,947	$ 7,569