General - Additional Information (Detail) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Jan. 30, 2016 USD ($) shares	Jan. 24, 2015 USD ($) shares	Jan. 30, 2016 USD ($) Segment shares	Jan. 24, 2015 USD ($) shares	Apr. 25, 2015 Segment
Accounting Policies [Abstract]
Number of reportable segments \| Segment			3		3
Income tax expense (benefit) related to cash flow hedges \| $	$ 268	$ (4,867)	$ 618	$ (12,001)
Securities excluded from calculation of diluted earnings per share \| shares	941	102	753	102

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration