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Organization - Additional Information (Detail)	9 Months Ended
	Jan. 31, 2016
DRP Acquisition
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Business acquisition agreement date	May 05, 2014
Battenfeld Acquisition Company Inc
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.

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