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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

X

- Definition

Deferred Compensation Plan Compensation Deferrals Percentage Allowed

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

+ References

No definition available.

+ Details

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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