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Employee Benefit Plans (Deferred Compensation Plan Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017
Deferred Compensation Plan |  |
Fair value of marketable securities | $ 17,748 | $ 15,043
Deferred compensation liability | $ 17,748 | 15,043
Deferred Compensation Plan |  |
Deferred Compensation Plan |  |
Percentage of vested salary and incentive compensation deferrals permitted to eligible employees | 100.00% |
Deferred compensation liability | $ 17,700 | 15,000
Deferred Compensation Plan | Other assets |  |
Deferred Compensation Plan |  |
Fair value of marketable securities | $ 17,700 | $ 15,000

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