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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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