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Total Debt Obligations, Including Capital Leases, Denominated in Foreign Currencies and US Dollar Equivalent (Detail) In Thousands, unless otherwise specified	Apr. 30, 2012 USD ($)	Apr. 30, 2011 USD ($)	Apr. 30, 2012 Euro USD ($)	Apr. 30, 2012 Euro EUR (€)	Apr. 30, 2011 Euro USD ($)	Apr. 30, 2011 Euro EUR (€)	Apr. 30, 2011 British Pound Sterling USD ($)	Apr. 30, 2011 British Pound Sterling GBP (£)	Apr. 30, 2012 Canadian Dollar USD ($)	Apr. 30, 2012 Canadian Dollar CAD	Apr. 30, 2011 Canadian Dollar USD ($)	Apr. 30, 2011 Canadian Dollar CAD
Debt and Capital Lease Obligations [Line Items]
Debt obligations	$ 51,049	$ 34,162	$ 4,623	€ 3,495	$ 4,730	€ 3,199	$ 11,830	£ 7,111	$ 46,426	45,887	$ 17,602	16,741

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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