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Summary of Term Debt (Parenthetical) (Detail) £ in Millions, SFr in Millions, AUD in Millions, € in Billions, ¥ in Billions, $ in Billions	12 Months Ended
	Sep. 26, 2015 USD ($)	Sep. 27, 2014 USD ($)	Sep. 26, 2015 JPY (¥)	Sep. 26, 2015 EUR (€)	Sep. 26, 2015 CHF (SFr)	Sep. 26, 2015 GBP (£)	Sep. 26, 2015 AUD
2013 debt issuance
Debt Instrument [Line Items]
Debt instrument, face amount	$ 17.0	$ 17.0
2013 debt issuance | Fixed-rate 0.45% - 3.85% notes
Debt Instrument [Line Items]
Debt instrument interest rate, minimum	0.45%	0.45%
Debt instrument interest rate, maximum	3.85%	3.85%
2014 debt issuance
Debt Instrument [Line Items]
Debt instrument, face amount	$ 12.0	$ 12.0
2014 debt issuance | Fixed-rate 1.05% - 4.45% notes
Debt Instrument [Line Items]
Debt instrument interest rate, minimum	1.05%	1.05%
Debt instrument interest rate, maximum	4.45%	4.45%
First quarter 2015 euro-denominated debt issuance
Debt Instrument [Line Items]
Debt instrument, face amount | €				€ 2.8
First quarter 2015 euro-denominated debt issuance | Fixed-rate 1.000% notes
Debt Instrument [Line Items]
Debt instrument interest rate	1.00%		1.00%	1.00%	1.00%	1.00%	1.00%
First quarter 2015 euro-denominated debt issuance | Fixed-rate 1.625% notes
Debt Instrument [Line Items]
Debt instrument interest rate	1.625%		1.625%	1.625%	1.625%	1.625%	1.625%
Second quarter 2015 debt issuance
Debt Instrument [Line Items]
Debt instrument, face amount	$ 6.5
Second quarter 2015 debt issuance | Fixed-rate 1.55% notes
Debt Instrument [Line Items]
Debt instrument interest rate	1.55%		1.55%	1.55%	1.55%	1.55%	1.55%
Second quarter 2015 debt issuance | Fixed-rate 2.15% notes
Debt Instrument [Line Items]
Debt instrument interest rate	2.15%		2.15%	2.15%	2.15%	2.15%	2.15%
Second quarter 2015 debt issuance | Fixed-rate 2.50% notes
Debt Instrument [Line Items]
Debt instrument interest rate	2.50%		2.50%	2.50%	2.50%	2.50%	2.50%
Second quarter 2015 debt issuance | Fixed-rate 3.45% notes
Debt Instrument [Line Items]
Debt instrument interest rate	3.45%		3.45%	3.45%	3.45%	3.45%	3.45%
Second quarter 2015 Swiss franc-denominated debt issuance
Debt Instrument [Line Items]
Debt instrument, face amount | SFr					SFr 1,250
Second quarter 2015 Swiss franc-denominated debt issuance | Fixed-rate 0.375% notes
Debt Instrument [Line Items]
Debt instrument interest rate	0.375%		0.375%	0.375%	0.375%	0.375%	0.375%
Second quarter 2015 Swiss franc-denominated debt issuance | Fixed-rate 0.750% notes
Debt Instrument [Line Items]
Debt instrument interest rate	0.75%		0.75%	0.75%	0.75%	0.75%	0.75%
Third quarter 2015 debt issuance
Debt Instrument [Line Items]
Debt instrument, face amount	$ 8.0
Third quarter 2015 debt issuance | Fixed-rate 0.900% notes
Debt Instrument [Line Items]
Debt instrument interest rate	0.90%		0.90%	0.90%	0.90%	0.90%	0.90%
Third quarter 2015 debt issuance | Fixed-rate 2.000% notes
Debt Instrument [Line Items]
Debt instrument interest rate	2.00%		2.00%	2.00%	2.00%	2.00%	2.00%
Third quarter 2015 debt issuance | Fixed-rate 2.700% notes
Debt Instrument [Line Items]
Debt instrument interest rate	2.70%		2.70%	2.70%	2.70%	2.70%	2.70%
Third quarter 2015 debt issuance | Fixed-rate 3.200% notes
Debt Instrument [Line Items]
Debt instrument interest rate	3.20%		3.20%	3.20%	3.20%	3.20%	3.20%
Third quarter 2015 debt issuance | Fixed-rate 4.375% notes
Debt Instrument [Line Items]
Debt instrument interest rate	4.375%		4.375%	4.375%	4.375%	4.375%	4.375%
Third quarter 2015 Japanese yen-denominated debt issuance
Debt Instrument [Line Items]
Debt instrument, face amount | ¥			¥ 250.0
Third quarter 2015 Japanese yen-denominated debt issuance | Fixed-rate 0.35% notes
Debt Instrument [Line Items]
Debt instrument interest rate	0.35%		0.35%	0.35%	0.35%	0.35%	0.35%
Fourth quarter 2015 British pound-denominated debt issuance
Debt Instrument [Line Items]
Debt instrument, face amount | £						£ 1,250
Fourth quarter 2015 British pound-denominated debt issuance | Fixed-rate 3.05% notes
Debt Instrument [Line Items]
Debt instrument interest rate	3.05%		3.05%	3.05%	3.05%	3.05%	3.05%
Fourth quarter 2015 British pound-denominated debt issuance | Fixed-rate 3.60% notes
Debt Instrument [Line Items]
Debt instrument interest rate	3.60%		3.60%	3.60%	3.60%	3.60%	3.60%
Fourth quarter 2015 Australian dollar-denominated debt issuance
Debt Instrument [Line Items]
Debt instrument, face amount | AUD							AUD 2,250
Fourth quarter 2015 Australian dollar-denominated debt issuance | Fixed-rate 2.85% notes
Debt Instrument [Line Items]
Debt instrument interest rate	2.85%		2.85%	2.85%	2.85%	2.85%	2.85%
Fourth quarter 2015 Australian dollar-denominated debt issuance | Fixed-rate 3.70% notes
Debt Instrument [Line Items]
Debt instrument interest rate	3.70%		3.70%	3.70%	3.70%	3.70%	3.70%
Fourth quarter 2015 euro-denominated debt issuance
Debt Instrument [Line Items]
Debt instrument, face amount | €				€ 2.0
Fourth quarter 2015 euro-denominated debt issuance | Fixed-rate 1.375% notes
Debt Instrument [Line Items]
Debt instrument interest rate	1.375%		1.375%	1.375%	1.375%	1.375%	1.375%
Fourth quarter 2015 euro-denominated debt issuance | Fixed-rate 2.000% notes
Debt Instrument [Line Items]
Debt instrument interest rate	2.00%		2.00%	2.00%	2.00%	2.00%	2.00%

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

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