Segment and Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2016
Segment financial information
Net sales	$ 608,123	$ 610,346	$ 1,232,971	$ 1,252,250
Operating income for reportable segments	37,656	38,362	80,874	79,388
Assets used in business	1,294,516	1,350,395	1,294,516	1,350,395	$ 1,312,025
Depreciation and amortization of property	3,837	4,080	7,487	8,010
Capital expenditures	3,711	2,625	6,710	5,737
Operating Segments [Member]
Segment financial information
Operating income for reportable segments	31,787	37,146	69,261	76,309
Service Center Based Distribution [Member]
Segment financial information
Net sales	501,950	507,906	1,017,583	1,041,513
Operating income for reportable segments	21,209	28,401	46,855	57,302
Assets used in business	1,084,878	1,143,601	1,084,878	1,143,601
Depreciation and amortization of property	3,522	3,695	6,842	7,312
Capital expenditures	3,616	2,424	6,242	5,311
Fluid Power Businesses [Member]
Segment financial information
Net sales	106,173	102,440	215,388	210,737
Operating income for reportable segments	10,578	8,745	22,406	19,007
Assets used in business	209,638	206,794	209,638	206,794
Depreciation and amortization of property	315	385	645	698
Capital expenditures	$ 95	$ 201	$ 468	$ 426