Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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- Definition

This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic).

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Earnings Per Share - Schedule of Numerator and Denominator Used in Computation of Earnings Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013 Class A Common Stock [Member]	Apr. 30, 2013 Class A Common Stock [Member]	Jul. 31, 2012 Class A Common Stock [Member]	Jul. 31, 2013 Class B Common Stock [Member]	Apr. 30, 2013 Class B Common Stock [Member]	Jul. 31, 2012 Class B Common Stock [Member]
Numerator:
Loss from continuing operations before discontinued operations attributable to common stockholders	$ (142)	$ (8,155)
Number of shares outstanding, end of period:
Common stock shares outstanding			38,944,000	38,662,000	26,367,000	988,000	988,000	988,000
Unvested restricted stock	(131,000)	(127,000)
Effect of weighted average shares outstanding during period	(139,000)	(236,000)
Weighted average number of common shares used in basic and diluted EPS	39,662,000	26,992,000
Number of antidilutive potentially issuable shares not included in the diluted earnings per share calculations due to loss from continuing operations	2,273,000	2,601,000