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Consolidated Statements of Comprehensive Earnings (unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]        
Net Earnings $ 102,125 $ 96,034 $ 197,452 $ 192,240
Net Actuarial Change in Defined Benefit Plans        
Amortization of Net Actuarial Loss 36 34 72 67
Tax Expense (9) (8) (18) (16)
Comprehensive Earnings $ 102,152 $ 96,060 $ 197,506 $ 192,291