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Acquisitions - Additional Information (Details)
 9 Months Ended
Mar. 01, 2021
USD ($)
Location
Mar. 31, 2021
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Business Acquisition [Line Items]          
Total purchase consideration, net of cash acquired   $ 748,000      
Contingent consideration fair value     $ 0    
Goodwill   50,658,000 $ 50,010,000 $ 50,433,000 $ 50,397,000
Maximum additional consideration payable   $ 2,100,000      
AMPM          
Business Acquisition [Line Items]          
Acquisition date Mar. 01, 2021        
Number of respiratory products and services locations | Location 9        
Total purchase consideration $ 1,100,000        
Total purchase consideration, net of cash acquired 400,000        
Escrow for potential satisfaction of certain indemnification obligations 300,000        
Contingent consideration fair value 400,000        
Goodwill 700,000        
Maximum additional consideration payable $ 2,100,000        
AMPM | Volatility          
Business Acquisition [Line Items]          
Contingent consideration, fair value estimation 40.0 40.0      
AMPM | Discount Rate          
Business Acquisition [Line Items]          
Contingent consideration, fair value estimation 10.3 10.3      
AMPM | Trade Names          
Business Acquisition [Line Items]          
Intangible assets $ 400,000