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Financial Instruments - Additional Information (Detail) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 26, 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 |
Net cash collateral posted, derivative instruments | $ 3 |
Net cash collateral received, derivative instruments |  | $ 1,000
Reduction to derivative assets by rights of set-off associated with derivative contracts | 1,400 | 2,200
Reduction to derivative liabilities by rights of set-off associated with derivative contracts | 1,400 | 2,200
Net derivative assets (liabilities) | $ (119) | $ (78)
Number of customers representing a significant portion 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 | 12.00% | 12.00%
Trade Receivables | Credit Concentration Risk | Cellular Network Carriers |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage | 55.00% | 71.00%
Non-Trade Receivables | Credit Concentration Risk | Vendor One |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage | 55.00% | 38.00%
Non-Trade Receivables | Credit Concentration Risk | Vendor Two |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage | 14.00% | 18.00%
Non-Trade Receivables | Credit Concentration Risk | Vendor Three |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage | 11.00% | 14.00%

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- Definition The potential effects of rights of set-off associated with the Company's derivative contracts, including the effects of collateral, which would result in a reduction to derivative assets. + References No definition available. + Details
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- Definition The maximum maturity period (in years) for the Company's long term marketable securities. + References No definition available. + Details
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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959 + Details
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