Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Deferred tax assets derived from:
Allowance for accounts receivable	$ 6,466	$ 7,387
Inventories	3,226	3,255
Nondeductible accrued expenses	11,109	9,054
Net operating loss carryforwards	3,083	73
Tax credits	6,734	6,046
Timing of amortization deduction from goodwill	12,516	6,406
Deferred compensation	7,247	6,396
Stock compensation	3,034	3,034
Timing of amortization deduction from intangible assets	4,145	3,110
Total deferred tax assets	57,560	44,761
Valuation allowance	(9,195)	(4,447)
Total deferred tax assets, net of allowance	48,365	40,314
Deferred tax liabilities derived from:
Timing of depreciation and other deductions from building and equipment	(3,347)	(6,618)
Timing of amortization deduction from goodwill	(7,390)	(3,742)
Timing of amortization deduction from intangible assets	(16,882)	(14,507)
Total deferred tax liabilities	(27,619)	(24,867)
Net deferred tax assets	$ 20,746	$ 15,447