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Schedule II - Valuation and Qualifying Accounts (Notes)
 12 Months Ended
Jun. 30, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]  
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Schedule II - Valuation and Qualifying Accounts

Description
 
Balance at Beginning of Year
 
Additions:
Charges to Costs and Expenses
 
Deductions:
Returns and Write-Offs
 
Balance at End of Year
 
 
(Dollars in Thousands)
Year ended June 30, 2020
Allowance for doubtful accounts
 
$
(3,349
)
 
$
(5,255
)
 
$
1,980

 
$
(6,624
)
Year ended June 30, 2019
Allowance for doubtful accounts
 
(2,703
)
 
(1,621
)
 
975

 
(3,349
)
Year ended June 30, 2018
Allowance for doubtful accounts
 
(1,285
)
 
(2,463
)
 
1,045

 
(2,703
)