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Fair Value Measurements (Tables)
6 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments The summary below details the carrying amounts and estimated fair values of these instruments at September 30, 2025 and March 31, 2025.
September 30, 2025March 31, 2025
(In thousands)Carrying ValueFair ValueCarrying ValueFair Value
2019 Senior Notes400,000 397,000 400,000 392,000 
2021 Senior Notes600,000 553,500 600,000 537,750