Fair Value of Financial Instruments - (Carrying Amounts and Estimated Fair Values) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Mar. 31, 2023
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives, Financial assets	$ 0	$ 0
Senior Notes, Financial liabilities	300,000	300,000
Derivatives	(25,155)	(16,088)
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives, Financial assets	0	0
Senior Notes, Financial liabilities	285,000	276,000
Derivatives	$ (25,155)	$ (16,088)