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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2020
Other comprehensive income (loss):      
Unamortized retirement costs, tax (expense) benefit $ (13,440) $ (2,103) $ 10,137
Unrealized gain (loss) on interest rate swaps, tax (expense) benefit $ (2,787) $ (657) $ 2,114