Note 1. Business Description and Summary of Significant Accounting Policies - Textuals (Details) - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jul. 01, 2019
Accounts Receivable Sold Without Recourse	$ 280,700,000	$ 261,200,000	$ 181,500,000
Accounts Receivable, Extended Payment Terms	45 days
Factoring Fees	$ 1,900,000	1,700,000	1,100,000
DueFromBankersAcceptanceDrafts	7,100,000	4,200,000
SettlementofBankersAcceptanceDrafts	6,800,000	2,700,000	5,500,000
Impairment of Intangible Assets, Finite-lived	0	0	0
Research and Development Costs	$ 17,000,000	15,000,000	11,000,000
Self-Insured Workforce Coverage Percent	20.00%
Self Insurance Reserve, Current	$ 1,600,000	1,700,000
Other General Income	0	$ (307,000)	$ 0
Operating Lease, Right-of-Use Asset	2,025,000
Operating Lease, Liability	$ 2,025,000
Minimum
Accounts Receivable, Customary Payment Terms	30 days
Maximum
Accounts Receivable, Customary Payment Terms	45 days
Accounting Standards Update 2016-02
Operating Lease, Right-of-Use Asset				$ 2,600,000
Operating Lease, Liability				2,600,000
Cumulative Effect of New Accounting Principle in Period of Adoption				$ 0
Lease, Practical Expedients, Package [true false]	true