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Financial Instruments - Additional Information (Detail) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 25, 2016 USD ($) Vendor Customer | Sep. 26, 2015 USD ($) Vendor Customer
Financial Instruments [Line Items] |  |
Maturities of long-term marketable securities, minimum | 1 year |
Maturities of long-term marketable securities, maximum | 5 years |
Hedged foreign currency transactions, typical term | 12 months |
Hedged interest rate transactions, expected period to be recognized | 10 years |
Reduction to derivative assets by rights of set-off associated with derivative contracts | $ 1,300 | $ 2,200
Reduction to derivative liabilities by rights of set-off associated with derivative contracts | 1,300 | 2,200
Net derivative assets (liabilities) | $ 353 | $ (78)
Number of customers representing 10% or more of trade receivables | Customer | 1 | 1
Number of vendors representing a significant portion of non-trade receivables | Vendor | 3 | 3
Trade Receivables | Credit Concentration Risk | Customer One |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage | 11.00% | 12.00%
Trade Receivables | Credit Concentration Risk | Cellular Network Carriers |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage | 59.00% | 71.00%
Non-Trade Receivables | Credit Concentration Risk | Vendor One |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage | 47.00% | 38.00%
Non-Trade Receivables | Credit Concentration Risk | Vendor Two |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage | 17.00% | 18.00%
Non-Trade Receivables | Credit Concentration Risk | Vendor Three |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage | 16.00% | 14.00%
Other Current Assets |  |
Financial Instruments [Line Items] |  |
Net cash collateral posted, fair value | $ 175 |
Accrued Expenses |  |
Financial Instruments [Line Items] |  |
Net cash collateral received, derivative instruments |  | $ 1,000

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