Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Narrative (Details)

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Stockholders' Equity - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
$ / shares
shares
Nov. 30, 2017
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
Sep. 30, 2015
executive
$ / shares
shares
Sep. 30, 2017
shares
May 31, 2017
shares
Mar. 31, 2017
shares
Sep. 30, 2016
shares
Class of Stock [Line Items]                      
Shares issued (in dollars per share) | $ / shares $ 27.15                    
Period of consecutive trading days 20 days                    
Period following an executive's termination of employment for a number of reasons 18 months                    
Shares of common stock authorized to be repurchased (up to) (in shares) | shares               7,000,000 2,000,000 5,000,000 50,000
Cash capital contribution required, due to catastrophe         $ 2,041,000            
Capital contribution received from parent         1,041,000            
Capital contribution received from noncontrolling interest         1,000,000 $ 0          
Corporate, General and Administrative Expense                      
Class of Stock [Line Items]                      
Stock-based compensation expense     $ 238,000 $ 163,000 621,000 581,000          
Remy W. Trafelet                      
Class of Stock [Line Items]                      
Options granted in period (in shares) | shares 300,000                    
Henry R. Slack                      
Class of Stock [Line Items]                      
Options granted in period (in shares) | shares 225,000                    
Tranche One                      
Class of Stock [Line Items]                      
Percentage of options 25.00%                    
Amount per share (in dollars per share) | $ / shares $ 60.00                    
Tranche Two                      
Class of Stock [Line Items]                      
Percentage of options 25.00%                    
Amount per share (in dollars per share) | $ / shares $ 75.00                    
Tranche Three                      
Class of Stock [Line Items]                      
Percentage of options 25.00%                    
Amount per share (in dollars per share) | $ / shares $ 90.00                    
Tranche Four                      
Class of Stock [Line Items]                      
Percentage of options 25.00%                    
Amount per share (in dollars per share) | $ / shares $ 105.00                    
Restricted Stock                      
Class of Stock [Line Items]                      
Stock-based compensation expense     37,000 27,000 100,000 238,000          
Restricted shares awarded (in shares) | shares   5,000         12,500        
Number of senior executives | executive             2        
Weighted average fair value (in dollars per share) | $ / shares   $ 31.95         $ 49.49        
Award vesting period   3 years                  
Unrecognized expense     209,000 149,000 209,000 149,000          
Employee Stock Option                      
Class of Stock [Line Items]                      
Stock-based compensation expense     205,000 205,000 616,000 411,000          
Unrecognized expense     $ 1,414,000 $ 2,030,000 $ 1,414,000 $ 2,030,000          
Weighted average remaining contractual term         1 year 9 months 29 days            
Weighted average grant date fair value of option grants (in dollars per share) | $ / shares     $ 3.53   $ 3.53            
Two Thousand and Seventeen Authorization Program                      
Class of Stock [Line Items]                      
Shares purchased (in shares) | shares     64,741   72,266            
Cost of shares     $ 2,009,117   $ 2,214,756            
Authorized amount     $ 1,721,427   $ 1,721,427            
Minimum | Restricted Stock                      
Class of Stock [Line Items]                      
Award vesting period             3 years        
Maximum | Restricted Stock                      
Class of Stock [Line Items]                      
Award vesting period             5 years