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Marketable Securities (Narratives) (Details) - USD ($)	12 Months Ended
Marketable Securities (Narratives) (Details) - USD ($)	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Apr. 01, 2018
Gain (Loss) on Securities [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ (888,000)
Net realized gains to sales of marketable securities	201,000	$ 0	$ 161,000
Net unrealized gains included in the balance sheet		524,000
Deferred tax liabilities on marketable securities		110,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ 2,097,000	$ (5,205,000)	$ (6,442,000)
Equity Method Investment, Ownership Percentage	49.00%
Unrealized Loss on Securities	$ 183,000
EMC [Member]
Gain (Loss) on Securities [Line Items]
Due from Related Parties, Current	2,986,000
Equity Method Investments	3,359,000
Equity Method Investment, Underlying Equity in Net Assets	3,602,000
Accounting Standards Update 2016-01 [Member]
Gain (Loss) on Securities [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	(888,000)			$ 888,000
EMC [Member]
Gain (Loss) on Securities [Line Items]
Investment Income, Net	$ 449,000