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Line of Credit (Details) - Line of Credit - USD ($)
$ in Millions
12 Months Ended
Jan. 31, 2014
Jun. 30, 2018
Jun. 30, 2017
Line of credit      
Maximum borrowing capacity $ 100.0    
Term of debt 5 years    
Borrowings from line of credit   $ 0.0 $ 0.0
Line of credit, amount outstanding   $ 0.0 $ 0.0
Prime Rate      
Line of credit      
Interest rate base prime rate    
Interest rate spread added to base rate (as a percent) 0.25%    
Base Rate      
Line of credit      
Interest rate base Federal Funds Rates    
Interest rate spread added to base rate (as a percent) 0.75%    
LIBOR      
Line of credit      
Interest rate base LIBOR    
Interest rate spread added to base rate (as a percent) 1.25%