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Earnings Per Common Share - Additional Information (Detail) (USD $)	3 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Earnings Per Share [Line Items]
Options to Purchase Excluded	1,511,513	1,503,875
Options to Purchase Outstanding	3,856,135	3,689,002
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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