Derivatives (Table Text Block)	12 Months Ended
	Mar. 31, 2023
Derivative Instrument Detail [Abstract]
Derivative Fair Values Located in Accounts Payable and Accrued Expenses in the Balance Sheet	March 31, 2023   March 31, 2022     (In thousands) Interest rate swaps designated as cash flow hedges         Assets $ 5,311 $ – Liabilities   –   587 Notional amount   206,347   235,000
Effect of Interest Rate Contracts on the Statement of Operations	Derivatives Fair Values as of     March 31, 2023   March 31, 2022               (In thousands) Equity market contracts as economic hedging instruments         Assets $ 4,295 $ 7,474 Liabilities $ – $ – Notional amount$ 465,701 $ 416,739