Annual report pursuant to Section 13 and 15(d)

Income Taxes - Income from Continuing Operations before Provision for Income Taxes and Equity in Earnings of Unconsolidated Subsidiaries (Detail)

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Income Taxes - Income from Continuing Operations before Provision for Income Taxes and Equity in Earnings of Unconsolidated Subsidiaries (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Income Tax Disclosure [Abstract]      
Domestic $ (22,350) $ 46,867 $ 5,539
Foreign 156,379 158,866 110,470
Income before provision for income taxes and equity in earnings of unconsolidated subsidiaries $ 134,029 $ 205,733 $ 116,009