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Employee Benefit Plans (Deferred Compensation Plan Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018
Deferred Compensation Plan |  |
Fair value of marketable securities | $ 20,363 | $ 17,748
Deferred compensation liability | $ 20,363 | 17,748
Deferred Compensation Plan |  |
Deferred Compensation Plan |  |
Percentage of vested salary and incentive compensation deferrals permitted to eligible employees | 100.00% |
Deferred compensation liability | $ 20,400 | 17,700
Deferred Compensation Plan | Other assets |  |
Deferred Compensation Plan |  |
Fair value of marketable securities | $ 20,400 | $ 17,700

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