Legal Proceedings - Additional Information (Detail) $ in Thousands						6 Months Ended
	Nov. 27, 2013 LegalMatter	Jun. 14, 2013 LegalMatter	Apr. 23, 2013 LegalMatter	Apr. 17, 2012 LegalMatter	Aug. 05, 2011 LegalMatter	Oct. 31, 2015 USD ($)
Legal Claim
Loss Contingencies [Line Items]
Number of putative shareholder derivative complaints filed		1
Damages awarded | $						$ 1,330
Kevin Khoa Nguyen
Loss Contingencies [Line Items]
Number of putative shareholder derivative complaints filed				1
Lina
Loss Contingencies [Line Items]
Number of putative shareholder derivative complaints filed					1
Jones
Loss Contingencies [Line Items]
Number of putative shareholder derivative complaints filed			1
Carag
Loss Contingencies [Line Items]
Number of putative shareholder derivative complaints filed	1