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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) shares in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2019 | Sep. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018 | Dec. 31, 2018
Basis of Presentation and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash equivalents description |  |  |  | Cash equivalents represent highly liquid investments, with original maturities of 90 days or less, while investments with longer maturities are classified as investments. |  |
Cash, cash equivalents and investments |  | $ 405,000,000 |  | $ 405,000,000 |  | $ 1,735,000,000
Allowance for doubtful accounts description |  |  |  | Past due balances over 90 days and over a specified amount are reviewed individually for collectibility. |  |
Contingent consideration |  | 2,822,000 |  | $ 2,822,000 |  | 2,476,000
Long-term debt |  | 1,255,601,000 |  | $ 1,255,601,000 |  | 1,148,172,000
Foreign currency exposure |  |  |  | The Company is a global company that operates in over 35 countries and, as a result, the Company’s net sales, cost of sales, operating expenses and balance sheet amounts are significantly impacted by fluctuations in foreign currency exchange rates. |  |
Maturity period of foreign exchange contracts |  |  |  | The Company periodically aggregates its net worldwide balances by currency and then enters into foreign currency exchange contracts that mature within 90 days to hedge a portion of the remaining balance to minimize some of the Company’s currency price risk exposure. The foreign currency exchange contracts are not designated for hedge accounting treatment. |  |
Treasury stock |  | 588,207,000 | $ 263,505,000 | $ 1,904,711,000 | $ 816,649,000 |
Severance and related costs |  |  |  | 9,000,000 |  |
Percentage of workforce reduction | 1.00% |  |  |  |  |
Accrued treasury stock repurchases |  | 18,016,000 |  | 18,016,000 |  | $ 23,005,000
Payments to Acquire Investments |  |  |  | $ 35,523,000 | $ 908,147,000 |
January 2019 Program [Member] |  |  |  |  |  |
Basis of Presentation and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Stock repurchase program authorization amount | $ 4,000,000,000 |  |  |  |  |
Stock repurchase program period | 2 years |  |  |  |  |
Treasury stock shares acquired |  |  |  | 7.8 |  |
Treasury stock |  |  |  | $ 1,700,000,000 |  |
Stock repurchase program remaining amount authorized for future purchases |  | 2,300,000,000 |  | $ 2,300,000,000 |  |
Cross Currency Interest Rate Contract [Member] |  |  |  |  |  |
Basis of Presentation and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Term of derivative agreement |  |  |  | 3 years |  | 3 years
Notional value, derivative asset |  | 110,000,000 |  | $ 110,000,000 |  | $ 300,000,000
Unsecured Debt [Member] |  |  |  |  |  |
Basis of Presentation and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Long-term debt |  | 1,100,000,000 |  | 1,100,000,000 |  | 560,000,000
Unsecured Debt [Member] | Fixed Interest Rate [Member] |  |  |  |  |  |
Basis of Presentation and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Long-term debt |  | 1,000,000,000.0 |  | 1,000,000,000.0 |  | 510,000,000
Fair value of fixed interest rate debt |  | 1,000,000,000.0 |  | 1,000,000,000.0 |  | 502,000,000
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |  |
Basis of Presentation and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Contingent consideration |  | 2,822,000 |  | 2,822,000 |  | 2,476,000
Held In Currencies Other Than Us Dollars [Member] |  |  |  |  |  |
Basis of Presentation and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash, cash equivalents and investments |  | 235,000,000 |  | $ 235,000,000 |  | 251,000,000
Programs Authorized by Board of Directors [Member] |  |  |  |  |  |
Basis of Presentation and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Treasury stock shares acquired |  |  |  | 8.6 | 4.1 |
Treasury stock |  |  |  | $ 1,900,000,000 | $ 809,000,000 |
Related to Vesting of Restricted Stock Units [Member] |  |  |  |  |  |
Basis of Presentation and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Treasury stock |  |  |  | 8,000,000 | 9,000,000 |
Held By Foreign Subsidiaries [Member] |  |  |  |  |  |
Basis of Presentation and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash, cash equivalents and investments |  | $ 303,000,000 |  | 303,000,000 |  | $ 471,000,000
Developer of Laboratory Solutions [Member] |  |  |  |  |  |
Basis of Presentation and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Payments to Acquire Investments |  |  |  | $ 7,000,000 | $ 8,000,000 |

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