Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 525,433us-gaap_NetIncomeLoss	$ 398,354us-gaap_NetIncomeLoss	$ 397,232us-gaap_NetIncomeLoss
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	302,353	263,538	222,580
Share-based compensation expense	59,292us-gaap_ShareBasedCompensation	46,295us-gaap_ShareBasedCompensation	36,113us-gaap_ShareBasedCompensation
Provision for deferred income taxes	106,905us-gaap_DeferredIncomeTaxExpenseBenefit	(22,647)us-gaap_DeferredIncomeTaxExpenseBenefit	8,342us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in assets and liabilities (net of businesses acquired):
Receivables, net	(74,786)us-gaap_IncreaseDecreaseInReceivables	(9,599)us-gaap_IncreaseDecreaseInReceivables	(83,705)us-gaap_IncreaseDecreaseInReceivables
Inventory	8,117us-gaap_IncreaseDecreaseInInventories	(8,111)us-gaap_IncreaseDecreaseInInventories	(279)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other	(14,625)	(36,038)	(2,224)
Accounts payable	2,974	4,130	35,265
Accrued income taxes	(21,764)	14,694	(22,784)
Deferred revenue	4,346	18,053	33,277
Other accrued liabilities	(51,218)	27,196	84,497
Net cash provided by operating activities	847,027	695,865	708,314
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital purchases	(276,584)	(352,877)	(183,429)
Capitalized software development costs	(177,800)us-gaap_PaymentsToDevelopSoftware	(174,649)us-gaap_PaymentsToDevelopSoftware	(100,189)us-gaap_PaymentsToDevelopSoftware
Purchases of investments	(1,214,036)us-gaap_PaymentsToAcquireInvestments	(1,106,819)us-gaap_PaymentsToAcquireInvestments	(1,286,997)us-gaap_PaymentsToAcquireInvestments
Sales and maturities of investments	1,404,846	1,070,598	932,394
Purchase of other intangibles	(13,517)	(56,805)	(22,870)
Acquisition of businesses, net of cash acquired	(7,476)	(67,877)	(40,540)
Net cash used in investing activities	(284,567)	(688,429)	(701,631)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of long-term debt and capital lease obligations	(14,930)	(24,700)	(17,083)
Proceeds from excess tax benefits from share-based compensation	39,532	39,927	48,370
Proceeds from exercise of options	31,879	31,403	38,147
Treasury stock purchases	(217,082)	(170,042)	0
Contingent consideration payments for acquisition of businesses	(10,617)	(800)	(3,400)
Cash Grants	48,000cern_CashGrants	0cern_CashGrants	0cern_CashGrants
Other	2,894	4,823	0
Net cash provided by (used in) financing activities	(120,324)	(119,389)	66,034
Effect of exchange rate changes on cash and cash equivalents	(9,310)	(2,790)	1,257
Net increase (decrease) in cash and cash equivalents	432,826	(114,743)	73,974
Cash and cash equivalents at beginning of period	202,377	317,120	243,146
Cash and cash equivalents at end of period	635,203	202,377	317,120
Cash paid during the year for:
Interest	5,682us-gaap_InterestPaid	6,973us-gaap_InterestPaid	6,448us-gaap_InterestPaid
Income taxes, net of refunds	144,323us-gaap_IncomeTaxesPaidNet	175,377us-gaap_IncomeTaxesPaidNet	158,871us-gaap_IncomeTaxesPaidNet
Summary of acquisition transactions:
Fair value of net tangible assets (liabilities) acquired (assumed)	(1,509)	2,550	(6,375)
Fair value of intangible assets acquired	3,800	25,489	18,559
Fair value of goodwill	16,785	59,570	35,281
Less: Fair value of contingent liability payable	(11,600)	(18,982)	(1,916)
Cash paid for acquisitions	7,476	68,627	45,549
Cash acquired	0us-gaap_CashAcquiredFromAcquisition	(750)us-gaap_CashAcquiredFromAcquisition	(5,009)us-gaap_CashAcquiredFromAcquisition
Net cash used	$ 7,476	$ 67,877	$ 40,540

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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Period Type:	duration

- Definition

The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash outflow associated with the development or modification of software programs or applications for internal use (that is, not to be sold, leased or otherwise marketed to others) that qualify for capitalization.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

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-Topic 230

-SubTopic 10

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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- Definition

The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

+ References

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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