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Accumulated Other Comprehensive Loss - Reclassifications out of Accumulated Other Comprehensive Loss to Net Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Post-retirement Plans        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Income before income taxes $ 29 $ 22 $ 86 $ 88
Tax (benefit) expense (7) (5) (20) (21)
Net income 22 17 66 67
Derivatives designated as cash flow hedges        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Income before income taxes 5,410 1,081 15,215 604
Tax (benefit) expense (1,411) (283) (3,968) (158)
Net income $ 3,999 $ 798 $ 11,247 $ 446