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Debt Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Debt Instrument [Line Items]
Short-term debt	$ 115	$ 0
Long-term Debt and Lease Obligation	208	0
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	475	691	$ 1,747
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	$ 0	$ 0
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
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%)

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer.

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