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Earnings Per Common Share - Additional Information (Detail) (USD $)	3 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Earnings Per Share [Line Items]
Options to Purchase Excluded	900,500	1,511,513
Options to Purchase Outstanding	3,150,210	3,856,135
Class A Common Shares
Earnings Per Share [Line Items]
Dividends preference, per share	$ 0.05

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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