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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Other long-term obligations     $ 3,971 $ 4,590 $ 3,971 $ 4,590 $ 3,771
Selling, General and Administrative Expenses [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation cost related to stock options and RSUs recognized     $ 541 307 $ 860 $ 749  
Market-Based RSUs [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Risk-free interest rate           1.20%  
Volatility           33.08%  
Dividend yield           2.99%  
RSUs granted during the period (in shares)         0    
Stock Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Risk-free interest rate         2.21% 1.66%  
Volatility         34.45% 35.12%  
Dividend yield         2.90% 2.91%  
Stock options granted during the period (in shares)         119,000 151,350  
Weighted average fair value of stock options granted (in dollars per share)         $ 7.42 $ 6.25  
Stock options outstanding (in shares)     603,200   603,200    
Total unrecognized compensation cost related to non-vested stock option awards     $ 1,773   $ 1,773    
Equity incentive plan, weighted average recognition period         2 years 10 months 8 days    
Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
RSUs granted during the period (in shares)         73,680 66,602  
Weighted average fair value of restricted stock granted (in dollars per share)         $ 25.63 $ 21.47  
RSUs outstanding (in shares)     195,205   195,205    
Equity incentive plan, weighted average recognition period         2 years 4 months 17 days    
Total unrecognized compensation cost related to non-vested RSUs     $ 2,550   $ 2,550    
Restricted Stock Units (RSUs) [Member] | Board of Directors Chairman [Member]              
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            
Other long-term obligations       $ 144   $ 144  
2013 Equity Compensation Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Term of grant         10 years    
Shares available for grant (in shares)     536,368   536,368    
2013 Equity Compensation Plan [Member] | Service-Based Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting rate percentage         25.00%    
Award service period         1 year    
Third Anniversary [Member] | 2013 Equity Compensation Plan [Member] | Service-Based RSUs [Member] | Director [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting rate percentage         50.00%    
Fourth Anniversary [Member] | 2013 Equity Compensation Plan [Member] | Service-Based RSUs [Member] | Director [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting rate percentage         50.00%