Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Deferred tax assets derived from:
Allowance for accounts receivable	$ 11,687	$ 12,458
Inventories	5,235	4,799
Nondeductible accrued expenses	3,968	3,842
Net operating loss carryforwards	3,141	3,036
Tax credits	4,094	3,316
Timing of amortization deduction from goodwill	1,285	2,660
Deferred compensation	7,934	6,733
Stock compensation	5,424	6,014
Timing of amortization deduction from intangible assets	3,032	2,045
Total deferred tax assets	45,800	44,903
Valuation allowance	(3,473)	(3,029)
Total deferred tax assets, net of allowance	42,327	41,874
Deferred tax liabilities derived from:
Timing of depreciation and other deductions from building and equipment	(7,778)	(6,827)
Timing of amortization deduction from goodwill	(5,013)	(5,815)
Timing of amortization deduction from intangible assets	(2,053)	(2,974)
Total deferred tax liabilities	(14,844)	(15,616)
Net deferred tax assets	$ 27,483	$ 26,258