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Basic and Diluted Earnings Per Share - Additional Information (Detail) In Millions, unless otherwise specified	3 Months Ended
	Jul. 31, 2013
Earnings Per Share Disclosure [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, shares	0.3

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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