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Income Tax Audit/Change in Accounting Estimate (Details Textual)	6 Months Ended
	Jul. 31, 2012 USD ($)	Jul. 31, 2012 BRL	Apr. 30, 2012 USD ($)
Liability for Uncertain Tax Positions, Noncurrent			$ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	1,100,000	2,300,000
Deferred Tax Liabilities, Goodwill and Intangible Assets, Goodwill			$ 808,000

Amount of deferred tax liability attributable to taxable temporary differences from goodwill.

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- Definition

This element represents the total of interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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