Commitments and Contingencies (Narrative) (Details)	12 Months Ended
	Jun. 30, 2020 USD ($) vendor	Jun. 30, 2019 USD ($) vendor	Jun. 30, 2018 USD ($) vendor
Long-term Purchase Commitment [Line Items]
Capital expenditures	$ 6,387,000	$ 5,797,000	$ 6,998,000
Minimum [Member]
Long-term Purchase Commitment [Line Items]
Termination period under terms of distribution agreement (days)	30 days
Capital expenditures	$ 3,000,000.0
Maximum [Member]
Long-term Purchase Commitment [Line Items]
Termination period under terms of distribution agreement (days)	120 days
Capital expenditures	$ 6,000,000.0
Supplier Concentration Risk [Member] | Sales [Member]
Long-term Purchase Commitment [Line Items]
Concentration risk, supplier | vendor	10	10	10
Network1 [Member]
Long-term Purchase Commitment [Line Items]
Escrow deposits received from seller	$ 0	$ 6,400,000
Amount released from escrow		25,300,000
Cash held in escrow	4,800,000	$ 6,500,000
Undiscounted pre-acquisition contingencies, minimum	3,700,000
Undiscounted pre-acquisition contingencies, maximum	$ 14,800,000