Goodwill and Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018
Changes in the carrying amount of goodwill by reportable segment
Balance at beginning of period	$ 646,643	$ 206,135
Goodwill acquired during the period	0	441,689
Other, primarily currency translation	886	(1,181)
Balance at September 30, 2018	647,529	646,643
Service Center Based Distribution Segment [Member]
Changes in the carrying amount of goodwill by reportable segment
Balance at beginning of period	203,084	201,740
Goodwill acquired during the period	0	2,525
Other, primarily currency translation	886	(1,181)
Balance at September 30, 2018	203,970	203,084
Fluid Power Businesses Segment [Member]
Changes in the carrying amount of goodwill by reportable segment
Balance at beginning of period	443,559	4,395
Goodwill acquired during the period	0	439,164
Other, primarily currency translation	0	0
Balance at September 30, 2018	$ 443,559	$ 443,559