Goodwill and Intangibles (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Mar. 31, 2018	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	423,478	3,845
Other, primarily currency translation	170	(410)
Balance at end of period	629,783	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	2,525	3,220
Other, primarily currency translation	170	34
Balance at end of period	204,435	201,740
Fluid Power & Flow Control 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	420,953	625
Other, primarily currency translation	0	(444)
Balance at end of period	$ 425,348	$ 4,395