Segment and Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2011
Segment financial information
Net Sales	$ 570,397	$ 529,517	$ 1,149,971	$ 1,057,018
Operating income for reportable segments	33,335	33,056	76,602	67,947
Assets used in the business	898,013	829,630	898,013	829,630	914,931
Depreciation and amortization of property	2,780	2,783	5,598	5,496
Capital expenditures	6,880	12,931	14,022	13,804
Operating Segments [Member]
Segment financial information
Operating income for reportable segments	39,431	35,163	80,062	70,665
Service Center Based Distribution [Member]
Segment financial information
Net Sales	458,315	426,161	922,173	850,114
Operating income for reportable segments	29,280	25,288	58,674	51,356
Assets used in the business	681,019	630,572	681,019	630,572
Depreciation and amortization of property	2,353	2,286	4,651	4,463
Capital expenditures	6,546	12,832	13,346	13,549
Fluid Power Businesses [Member]
Segment financial information
Net Sales	112,082	103,356	227,798	206,904
Operating income for reportable segments	10,151	9,875	21,388	19,309
Assets used in the business	216,994	199,058	216,994	199,058
Depreciation and amortization of property	427	497	947	1,033
Capital expenditures	$ 334	$ 99	$ 676	$ 255