Annual report pursuant to Section 13 and 15(d)

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)

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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, unless otherwise specified
12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Income Taxes [Line Items]      
Domestic $ 15,915 $ 42,375 $ 56,741
Foreign 31,905 38,429 32,963
Income before provision for income taxes and equity in earnings of unconsolidated subsidiaries $ 47,820 $ 80,804 $ 89,704