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Derivatives (Table Text Block)
12 Months Ended
Mar. 31, 2022
Derivative Instrument Detail [Abstract]  
Derivative Fair Values Located in Accounts Payable and Accrued Expenses in the Balance Sheet           March 31, 2022   March 31, 2021     (In thousands) Interest rate contracts designated as hedging instruments         Assets $ – $ – Liabilities   587   5,141 Notional amount (debt)  235,000   235,000
Effect of Interest Rate Contracts on the Statement of Operations     The Effect of Interest Rate     Contracts on the Statements of Operations     Years Ended March 31,     2022   2021   2020     (In thousands) (Gain) loss recognized in AOCI on interest rate contracts $ (4,553) $ (3,071) $ 8,355 (Gain) loss reclassified from AOCI into income $( 3,948 )$( 3,640 )$ 3