Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Stock-Based Compensation (Details)

v3.3.1.900
Summary of Significant Accounting Policies - Stock-Based Compensation (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 27, 2015
shares
Jan. 31, 2014
shares
Sep. 30, 2015
senior_executive
$ / shares
shares
Sep. 30, 2014
USD ($)
shares
Sep. 30, 2013
shares
Dec. 31, 2013
shares
Feb. 28, 2013
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Treasury stock issued (in shares)   152,403 16,755 176,564 25,584    
Common shares (in shares)           58,610  
Employee stock options granted (in shares)     0 0 0    
Restricted Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation | $       $ 195      
Restricted Shares | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period     1 year        
Restricted Shares | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period     6 years        
2015 Plan | Restricted Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted shares of common stock awarded (in shares)     12,500        
Weighted average fair value (in dollars per share) | $ / shares     $ 49.49        
2015 Plan | Common Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Additional common shares available for issuance (up to) (in shares) 1,250,000            
2015 Plan | Common Shares | Restricted Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period     5 years        
2015 Plan | Common Shares | Restricted Shares | Senior Executives              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of senior executives | senior_executive     2        
2013 Plan | Restricted Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares of common stock that were to be awarded to recipients (in shares)             350,000