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Property, Plant, and Equipment - Narrative (Details) - USD ($)
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Property, Plant and Equipment [Abstract]      
Impairment charges $ 0 $ 0 $ 0
Depreciation 15,636,000 12,249,000 $ 10,004,000
Property, plant and equipment, disposals 383,000 958,000  
Loss on disposal $ 374,000 $ 61,000