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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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