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Stockholder's Equity (Details)
 1 Months Ended 12 Months Ended
Aug. 14, 2017
USD ($)
$ / shares
shares
Aug. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
unit_holder
vote
$ / shares
shares
Jun. 30, 2017
USD ($)
unit_holder
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jul. 06, 2017
shares
Feb. 01, 2016
USD ($)
Jun. 30, 2015
shares
Class of Stock [Line Items]                
Capital stock, shares authorized (in shares)     150,000,000          
Preferred stock, shares authorized (in shares)     25,000,000 25,000,000        
Preferred stock, par value (in dollars per share) | $ / shares     $ 0.01 $ 0.01        
Proceeds from issuance of common stock | $ $ 58,075,000              
Proceeds from issuance of common stock net of discounts and commissions | $ 55,317,000   $ 55,317,000 $ 0 $ 0      
Underwriting discounts and commissions | $ 2,758,000              
Amount of debt prepayment | $ $ 50,000,000 $ 50,000,000 $ 50,000,000 $ 72,000,000 $ 6,500,000      
Number of unit holders | unit_holder     11 4        
Treasury stock acquired, average cost per share (in dollars per share) | $ / shares         $ 13.82      
Stock repurchased during period | $         $ 3,984,000      
Number of votes | vote     1          
Common stock, conversion basis     1          
Number of LLC units outstanding (in shares)     21,598,534.000 19,198,314.000        
Ownership percentage     100.00% 100.00%        
Class A Common Stock                
Class of Stock [Line Items]                
Common stock, shares authorized (in shares)     100,000,000 100,000,000        
Common stock, shares issued (in shares) 2,300,000   20,555,348 17,937,687   39,262,000    
Share price (in dollars per share) | $ / shares $ 24.05              
Number of shares issued and sold 300,000              
Common stock, shares, outstanding (in shares)     20,555,348 17,937,687        
Stock repurchase program, authorized amount (up to) | $             $ 15,000,000  
Shares issued during period (in shares)     2,632,482          
Class B Common Stock                
Class of Stock [Line Items]                
Common stock, shares authorized (in shares)     25,000,000 25,000,000        
Common stock, shares issued (in shares)     17 19        
Treasury stock, shares, retired (in shares)     1 1 1      
Common stock, shares, outstanding (in shares)     17 19 23      
Common Stock                
Class of Stock [Line Items]                
Shares issued during period (in shares)         287,346      
Common shares, canceled (in shares)         287,346      
Parent                
Class of Stock [Line Items]                
Number of LLC units outstanding (in shares)     20,555,348 17,937,687        
Ownership percentage     95.20% 93.40%        
Common Stock | Class A Common Stock                
Class of Stock [Line Items]                
Common stock, shares, outstanding (in shares)     20,555,000 17,938,000 [1] 17,690,000     17,859,000
Shares issued during period (in shares)         288,000      
Stock repurchased during period | $         $ 3,000      
Common Stock | Class B Common Stock                
Class of Stock [Line Items]                
Common stock, shares, outstanding (in shares)     17 19.000 [1] 23     24
Additional Paid In Capital                
Class of Stock [Line Items]                
Stock repurchased during period | $         $ 3,981,000      
Non-controlling Interest in LLC                
Class of Stock [Line Items]                
Number of LLC units outstanding (in shares)     1,043,186 1,260,627        
Ownership percentage     4.80% 6.60%        
[1] As revised. Refer to Note 1 for information on immaterial correction of errors in prior period.