Domestic and Foreign Components of Income (Loss) From Continuing Operations Before Domestic and Foreign Income and Other Taxes And Equity in Earnings of Unconsolidated Subsidiaries (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Income Taxes [Line Items]
Domestic	$ 22,228	$ 65,885	$ 42,411
Foreign	26,534	53,817	56,603
Income before provision for income taxes and equity in earnings of unconsolidated subsidiaries	$ 48,762	$ 119,702	$ 99,014