Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Deferred tax assets derived from:
Allowance for accounts receivable	$ 10,681	$ 12,874
Inventories	4,561	4,060
Nondeductible accrued expenses	9,848	7,426
Net operating loss carryforwards	6,241	5,350
Tax credits	6,530	5,795
Timing of amortization deduction from goodwill	6,406	5,756
Deferred compensation	6,396	5,696
Stock compensation	3,034	2,809
Timing of amortization deduction from intangible assets	3,110	2,510
Total deferred tax assets	56,807	52,276
Valuation allowance	(7,238)	(5,098)
Total deferred tax assets, net of allowance	49,569	47,178
Deferred tax liabilities derived from:
Timing of depreciation and other deductions from building and equipment	(6,719)	(7,468)
Timing of amortization deduction from goodwill	(3,742)	(1,782)
Timing of amortization deduction from intangible assets	(15,779)	(17,498)
Total deferred tax liabilities	(26,240)	(26,748)
Net deferred tax assets	$ 23,329	$ 20,430