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Common Stock, Preferred Stock and Dividends (Detail Textuals) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Class of Stock [Line Items]      
Dividends paid $ 18,592 $ 16,073 $ 15,827
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%    
Class A common stock      
Class of Stock [Line Items]      
Dividends paid $ 18,592    
Class B common stock      
Class of Stock [Line Items]      
Class B common stock converted into Class A common shares 199,470 261,332  
Common stock holder entitled to vote per share 10 votes    
Dividends paid $ 18,592