Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Narrative (Details)

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Stockholders' Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Class of Stock [Line Items]                
Option price (in dollars per share) $ 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)             50,000 170,000
Shares available to purchase (in shares)             0  
Value of treasury stock shares purchased   $ 4,586   $ 4,586     $ 4,585  
Corporate, General and Administrative Expense                
Class of Stock [Line Items]                
Stock-based compensation expense   $ 190 $ 251 $ 629 $ 446      
Remy W. Trafelet                
Class of Stock [Line Items]                
Options granted in period (in shares) 300,000              
George R. Brokaw                
Class of Stock [Line Items]                
Options granted in period (in shares) 225,000              
Henry R. Slack                
Class of Stock [Line Items]                
Options granted in period (in shares) 225,000              
Tranche One                
Class of Stock [Line Items]                
Percentage of options 25.00%              
Amount per share (in dollars per share) $ 60.00              
Tranche Two                
Class of Stock [Line Items]                
Percentage of options 25.00%              
Amount per share (in dollars per share) $ 75.00              
Tranche Three                
Class of Stock [Line Items]                
Percentage of options 25.00%              
Amount per share (in dollars per share) $ 90.00              
Tranche Four                
Class of Stock [Line Items]                
Percentage of options 25.00%              
Amount per share (in dollars per share) $ 105.00              
Stock Option                
Class of Stock [Line Items]                
Options granted in period (in shares)       0        
Weighted average grant date fair value of option grant (in dollars per share)   $ 3.53   $ 3.53        
Stock options exercised (in shares)       0        
Stock options forfeited (in shares)       0        
Unrecognized compensation cost   $ 2,441   $ 2,441        
Weighted average period of cost expected to be recognized       3 years 1 month 12 days        
Stock-based compensation expense   $ 205            
2017 Authorization Program                
Class of Stock [Line Items]                
Treasury stock shares purchased (in shares)   24,502   24,502        
Value of treasury stock shares purchased   $ 641,000   $ 641,000        
2017 Authorization Program | Scenario, Forecast                
Class of Stock [Line Items]                
Shares of common stock authorized to be repurchased (up to) (in shares)           5,000,000