Annual report pursuant to Section 13 and 15(d)

Financial Instruments - Summary of Gains and Losses on Interest Rate Swap (Detail)

v3.19.2
Financial Instruments - Summary of Gains and Losses on Interest Rate Swap (Detail) - Interest Rate Swap - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Derivative [Line Items]      
(Losses) gains recognized in other comprehensive income (net of tax effects of ($281), $828, and ($406), respectively) $ (800) $ 1,465 $ (635)
Gains (losses) reclassified from accumulated other comprehensive income into interest (expense) income, net $ 376 $ (730) $ (94)