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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Other Comprehensive (Loss) Income:      
Unrealized retirement costs, net of tax benefit $ 1,337 $ 252 $ 3,286
Unrealized (loss) gain on interest rate swaps, net of tax benefit (expense) $ 1,161 $ (459) $ (1,709)