Summary of Term Debt (Parenthetical) (Detail) - USD ($) $ in Billions |
3 Months Ended | 12 Months Ended |
|---|---|---|
Dec. 26, 2015 |
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 | |
| 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% |