Summary of Term Debt (Parenthetical) (Detail) - USD ($) $ in Billions	6 Months Ended	12 Months Ended
Mar. 26, 2016	Sep. 26, 2015
2013 debt issuance
Debt Instrument [Line Items]
Debt instrument, face amount	$ 17.0	$ 17.0
2014 debt issuance
Debt Instrument [Line Items]
Debt instrument, face amount	12.0	12.0
2015 debt issuances
Debt Instrument [Line Items]
Debt instrument, face amount	27.3	$ 27.3
Second quarter 2016 debt issuance
Debt Instrument [Line Items]
Debt instrument, face amount	$ 15.5
Fixed-rate 0.45% - 3.85% notes \| 2013 debt issuance
Debt Instrument [Line Items]
Debt instrument interest rate, minimum	0.45%	0.45%
Debt instrument interest rate, maximum	3.85%	3.85%
Fixed-rate 1.05% - 4.45% notes \| 2014 debt issuance
Debt Instrument [Line Items]
Debt instrument interest rate, minimum	1.05%	1.05%
Debt instrument interest rate, maximum	4.45%	4.45%
Fixed-rate 0.35% - 4.375% notes \| 2015 debt issuances
Debt Instrument [Line Items]
Debt instrument interest rate, minimum	0.35%	0.35%
Debt instrument interest rate, maximum	4.375%	4.375%
Fixed-rate 1.30% notes \| Second quarter 2016 debt issuance
Debt Instrument [Line Items]
Debt instrument interest rate	1.30%
Fixed-rate 1.70% notes \| Second quarter 2016 debt issuance
Debt Instrument [Line Items]
Debt instrument interest rate	1.70%
Fixed-rate 2.25% notes \| Second quarter 2016 debt issuance
Debt Instrument [Line Items]
Debt instrument interest rate	2.25%
Fixed-rate 2.85% notes \| Second quarter 2016 debt issuance
Debt Instrument [Line Items]
Debt instrument interest rate	2.85%
Fixed-rate 3.25% notes \| Second quarter 2016 debt issuance
Debt Instrument [Line Items]
Debt instrument interest rate	3.25%
Fixed-rate 4.50% notes \| Second quarter 2016 debt issuance
Debt Instrument [Line Items]
Debt instrument interest rate	4.50%
Fixed-rate 4.65% notes \| Second quarter 2016 debt issuance
Debt Instrument [Line Items]
Debt instrument interest rate	4.65%

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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