Goodwill and Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 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	1,239	(410)
Balance at September 30, 2017	209,834	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	1,239	34
Balance at September 30, 2017	205,439	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 September 30, 2017	$ 4,395	$ 4,395