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Organization - Additional Information (Detail)	3 Months Ended
	Jul. 31, 2015
DRP Acquisition
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Business acquisition agreement date	May 05, 2014
BTI Acquisition
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Business acquisition agreement date	Dec. 11, 2014

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- Definition

Organization, consolidation and presentation of Financial statements.

+ References

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- Definition

Date when the business acquisition agreement was executed, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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