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Debt Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2019
Debt Instrument [Line Items]      
Interest paid $ 275 $ 283  
Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Unsecured Loan, Unused Borrowing Capacity $ 5,000    
Unsecured Loan, Maturity Date Apr. 30, 2021    
Unsecured Loan, Amount Outstanding $ 0    
Revolving Credit Facility [Member] | Line of Credit [Member]      
Debt Instrument [Line Items]      
Revolving Credit Facility, Current Borrowing Capacity 300,000    
Revolving Credit Facility, Maximum Borrowing Capacity $ 700,000    
Revolving Credit Facility, Expiration Date Feb. 10, 2025    
Long-term Debt $ 55,000   $ 0
Fed Funds Effective Rate Overnight Index Swap Rate [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]      
Debt Instrument [Line Items]      
Basis Spread on Variable Rate 0.50%    
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]      
Debt Instrument [Line Items]      
Basis Spread on Variable Rate 1.00%    
Prime Rate [Member] | Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Basis Spread on Variable Rate (1.00%)