Goodwill and Intangibles (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2017	Jun. 30, 2017
Changes in the carrying amount of goodwill by reportable segment
Balance at beginning of period	$ 206,135	$ 202,700
Goodwill acquired during the period	2,460	3,845
Other, primarily currency translation	406	(410)
Balance at end of period	209,001	206,135
Service Center Based Distribution Segment [Member]
Changes in the carrying amount of goodwill by reportable segment
Balance at beginning of period	201,740	198,486
Goodwill acquired during the period	2,460	3,220
Other, primarily currency translation	406	34
Balance at end of period	204,606	201,740
Fluid Power Businesses Segment [Member]
Changes in the carrying amount of goodwill by reportable segment
Balance at beginning of period	4,395	4,214
Goodwill acquired during the period	0	625
Other, primarily currency translation	0	(444)
Balance at end of period	$ 4,395	$ 4,395