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Employee Benefit Plans (Deferred Compensation Plan Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Deferred Compensation Plan    
Fair value of marketable securities $ 15,043 $ 14,836
Deferred compensation liability $ 15,043 14,836
Deferred Compensation Plan    
Deferred Compensation Plan    
Percentage of vested salary and incentive compensation deferrals permitted to eligible employees 100.00%  
Deferred compensation liability $ 15,000 14,800
Deferred Compensation Plan | Other assets    
Deferred Compensation Plan    
Fair value of marketable securities $ 15,000 $ 14,800