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Share-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Aug. 15, 2017
Aug. 11, 2015
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Selling, General and Administrative Expenses            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation cost related to stock options and RSUs recognized     $ 586 $ 541 $ 1,057 $ 860
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Risk-free interest rate           2.21%
Volatility           34.45%
Dividend yield           2.90%
Expected life of option           6 years 3 months
Stock options granted during the period (in shares)           119,000
Weighted average fair value of stock options granted (in dollars per share)           $ 7.42
Stock options outstanding (in shares)     414,975   414,975  
Total unrecognized compensation cost related to non-vested stock option awards     $ 994   $ 994  
Equity incentive plan, weighted average recognition period         2 years 1 month 7 days  
RSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
RSUs granted during the period (in shares)         189,013 73,680
Weighted average fair value of restricted stock granted (in dollars per share)         $ 14.65 $ 25.63
RSUs outstanding (in shares)     304,373   304,373  
Equity incentive plan, weighted average recognition period         2 years 2 months 1 day  
Total unrecognized compensation cost related to non-vested RSUs     $ 3,402   $ 3,402  
RSUs | Board of Directors Chairman            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
RSUs granted during the period (in shares)   10,000        
Lump sum cash payment of RSUs converted $ 266          
2013 Equity Compensation Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Term of grant         10 years  
Shares available for grant (in shares)     601,455   601,455  
2013 Equity Compensation Plan | Service-Based Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting rate percentage         25.00%  
Award service period         1 year  
Third Anniversary | 2013 Equity Compensation Plan | Service-Based RSUs | Director            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting rate percentage         50.00%  
Fourth Anniversary | 2013 Equity Compensation Plan | Service-Based RSUs | Director            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting rate percentage         50.00%  
Vesting beginning of each year | 2013 Equity Compensation Plan | Service-Based RSUs | Director            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting rate percentage         25.00%