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Commitments And Contingencies (Future Minimum Commitments Under Non-Cancelable Operating Leases) (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2012
Commitments And Contingencies [Abstract]
2013	$ 38,588
2014	34,609
2015	29,695
2016	21,619
2017	15,951
Thereafter	66,912
Total operating leases	$ 207,374

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The total of future contractually required payments on leases defined as operating.

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