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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

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