Other Long-Term Liabilities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Jan. 25, 2014
Short-term Debt [Line Items]
Junior seller note	$ 127,250
Junior seller note maturity period	2014-09

Carrying value as of the balance sheet date of portion of long-term debt due within one year or the operating cycle if longer identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_JuniorSubordinatedNotesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant