Dividends - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
May 03, 2014	Apr. 27, 2013	Apr. 28, 2012
Dividends Payable [Line Items]
Dividend paid to preferred shareholders	$ 15,768	$ 15,767	$ 7,081
Dividends paid to common stockholders	$ 0	$ 0

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration