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Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Oct. 31, 2014	Oct. 31, 2015	Apr. 30, 2015
Income Tax Contingency
Unrecognized tax benefits		$ 8,866	$ 8,043
Unrecognized tax benefits that would impact effective tax rate		5,799
Accrued interest and penalties related to unrecognized tax benefits		306	$ 152
Interest and penalties included in income tax expense	$ (185)	154
Expected decrease in unrecognized tax benefits		$ 2,926
Federal Tax Authority | Earliest Tax Year
Income Tax Contingency
Tax years open for examination		2011
State Tax Authority | Earliest Tax Year
Income Tax Contingency
Tax years open for examination		2010
Illinois | Tax Year 2011
Income Tax Contingency
Year under examination		2011
Illinois | Tax Year 2012
Income Tax Contingency
Year under examination		2012

X

- Definition

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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