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Unrecognized Tax Benefits (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Apr. 30, 2012
Unrecognized Tax Benefits [Abstract]
Gross unrecognized tax benefits	$ 8,482		$ 7,538
Unrecognized tax benefits impacting effective tax rate if recognized	5,513
Unrecognized tax benefits, accrued interest and penalties	314		249
Net interest and penalties included in income tax expense	65	29
Best estimate for reasonably change in amount of gross unrecognized tax benefits is a decrease during 12 months	$ 1,554
Federal statute of limitations for income tax filings, years open	2009 and forward
State statute of limitations for icome tax filings, years open	2008 and forward

This element represents the total of accruals as of the date of the statement of financial position for interest 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 for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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