Fair Value Measurement - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 28, 2014	Dec. 29, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Change in amount of contingent consideration	$ 22,400,000
Future funding commitments	22,900,000	27,700,000
Hedge funds redemption period	60 days
Hedge funds redemption potential holdback percentage	5.00%
Hedge funds redemption description	Shares in the hedge funds are generally redeemable twice a year or on the last business day of each quarter with at least 60 days written notice subject to potential 5% holdback. There are no unfunded commitments related to the hedge funds.
Fair value of total long-term debt	4,650,000,000us-gaap_LongTermDebtFairValue	3,930,000,000us-gaap_LongTermDebtFairValue
Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period of underlying assets of partnership investments, low estimate (in years)	8 years
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period of underlying assets of partnership investments, low estimate (in years)	10 years
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Effect of 1% change in growth rate on valuation of goodwill, increase (decrease)	2,800,000	1,400,000
Effect of 1% change in discount rate on valuation of goodwill, increase (decrease)	$ 2,800,000	$ 2,700,000
Level 3 \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rate (as a percent)	15.00%
Level 3 \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rate (as a percent)	27.00%
Digital \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rate (as a percent)	17.50%	16.00%
Long-term revenue growth rate (as a percent)	2.00%	3.00%
One Percentage Point Increase in growth rate and discount rate	1.00%
Publishing \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rate (as a percent)		20.50%
Long-term revenue growth rate (as a percent)		3.00%
One Percentage Point Increase in growth rate and discount rate		1.00%

Goodwill, Effect of One Percentage Point Change in Discount Rate on Valuation of Goodwill, Increase (Decrease)

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- Definition

Goodwill, Effect of One Percentage Point Change in Growth Rate on Valuation of Goodwill, Increase (Decrease)

+ References

No definition available.

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- Definition

One Percentage Point Increase in growth rate and discount rate

+ References

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- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 4

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Percentage of assumed long-term growth in revenues, used as an input to measure fair value.

+ References

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- Definition

Describes the terms and conditions for redemption of the entity's investment, or portion thereof (for example, quarterly redemption with 60 days notice), for each of those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments), by major category.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 6A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=SL6742756-110258

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- Definition

Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments.

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- Definition

Estimate remaining period the underlying assets are expected to be liquidated by the investees for investments for which net asset value per share is calculated (including by unit, membership interest, or other ownership interest unit measure), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 6A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=SL6742756-110258

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- Definition

The percentage of the total value of investments that cannot be redeemed because of a redemption restriction as of the statement of financial position date.

+ References

No definition available.

+ Details

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- Definition

The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 6A

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=SL6742756-110258

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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