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Income Taxes (Scheduled Expiration Dates Of The Company's Net Operating Loss And Tax Credit Carryforwards) (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2012
Operating Loss Carryforwards [Line Items]
Foreign net operating loss carryforwards	$ 93,017
State taxing jurisdiction net operating loss carryforwards	11,507
Foreign tax credit	3,333
Federal capital loss carryforwards	5,776
2012 Through 2016 [Member]
Operating Loss Carryforwards [Line Items]
Foreign net operating loss carryforwards	6,148
State taxing jurisdiction net operating loss carryforwards	63
Federal capital loss carryforwards	5,776
2017 Through 2026 [Member]
Operating Loss Carryforwards [Line Items]
Foreign net operating loss carryforwards	30,440
State taxing jurisdiction net operating loss carryforwards	11,444
Foreign tax credit	3,333
Indefinite [Member]
Operating Loss Carryforwards [Line Items]
Foreign net operating loss carryforwards	$ 56,429

The cumulative amount of future tax effects arising from the unused tax credit carryforward that cannot be utilized on the tax return during a year that may be carried forward to reduce taxable income or taxes payable in a future year; a tax credit carryforward is the amount by which tax credits available for utilization exceed statutory limitations.

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