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Summary of Significant Accounting Policies - Concentrations of Credit Risk - Additional Information (Detail)	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Accounting Policies [Abstract]
Concentration of credit risk	At April 30, 2014 and 2013, no single group or customer represented greater than [5%] of total accounts receivable-trade	At April 30, 2014 and 2013, no single group or customer represented greater than [5%] of total accounts receivable-trade
Maximum percentage of accounts receivable represented by single group or customer	5.00%	5.00%

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Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

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-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6327-108592



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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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