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Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Income Tax Disclosure [Abstract]
Operating loss carryforwards	$ 69,594
Alternative minimum tax credit carryforwards	156
Less valuation allowance	228	$ 0
Out of period adjustment		2,760
Unrecognized tax benefits	8,043	9,244	$ 8,938
Unrecognized tax benefits that would impact effective tax rate	5,264
Increase (decrease) in unrecognized tax benefits	(1,201)
Accrued interest and penalties	152	402
Increase in tax expense	(250)	$ 116
Decrease in unrecognized tax benefits is reasonable possible	$ 2,891

X

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

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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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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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense (benefit).

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