Guarantor Financial Information - Narrative (Details) - USD ($) $ in Millions	Jan. 29, 2016	Apr. 24, 2015
Condensed Financial Statements, Captions [Line Items]
Increase in shareholders' equity	$ 50,816	$ 53,230
Increase in investment in subsidiaries	0	0
Subsidiary Issuer [Member] \| CIFSA Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Increase in shareholders' equity	23,027	14,957
Increase in investment in subsidiaries	$ 33,441	20,836
Subsidiary Issuer [Member] \| CIFSA Notes [Member] \| Restatement adjustment [Member]
Condensed Financial Statements, Captions [Line Items]
Increase in shareholders' equity		14,700
Increase in investment in subsidiaries		$ 14,700

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707

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 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

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