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Common Stock, Preferred Stock and Dividends - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Class of Stock [Line Items]      
Dividends paid $ 19,430 $ 19,418 $ 18,592
BFI Co., LLC ("BFI")      
Class of Stock [Line Items]      
BFI ownership percentage at which the remaining Class B shares would convert to Class A 15.00%    
Common stock-Class A      
Class of Stock [Line Items]      
Dividends paid $ 19,430    
Common stock-Class B      
Class of Stock [Line Items]      
Common stock holder entitled to vote per share 10 votes    
Dividends paid $ 19,430    
Class B common stock converted into Class A common shares 0 0