Summary of Significant Accounting Policies (Policies)	3 Months Ended
Apr. 01, 2018
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Recently Adopted Accounting Pronouncements In March 2018, the Financial Accounting Standards Board (“FASB”) issued ASU 2018-05, which amends ASC Topic 740 “Income Taxes” to conform with SEC Staff Accounting Bulletin 118, issued in December 2017 which allowed SEC registrants to record provisional amounts for the year ended December 31, 2017, due to the complexities involved in accounting for the enactment of the 2017 Tax Cuts and Jobs Act (the “Act”). The standard is effective upon issuance. During the three months ended April 1, 2018, we have not recorded any measurement period adjustments to the provisional estimate recorded at December 31, 2017, for the Act. The accounting for the impact of the Act is expected to be completed by the fourth quarter of this year. In February 2018, the FASB issued Accounting Standards Update (“ASU”) 2018-02, “Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” The new guidance provides financial statement preparers with an option to reclassify stranded tax effects within accumulated other comprehensive income (“AOCI”) to retained earnings in each period in which the effect of the change in the U.S. federal corporate income tax rate related to the Tax Cuts and Jobs Act is recorded. The amendments are effective for all organizations for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The Company elected to adopt this guidance to reclassify the stranded tax effects from AOCI to retained earnings in the first quarter of 2018. Our current accounting policy related to releasing tax effects from AOCI for pension and other postretirement benefits is a plan by plan approach. Accordingly, the Company recorded a $94.1 million cumulative effect adjustment for stranded tax effects, such as pension and other postretirement benefits, to “Retained earnings” on January 1, 2018. See Note 13 for more information. In March 2017, the FASB issued ASU 2017-07, “Compensation—Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.” The new guidance requires the service cost component to be presented separately from the other components of net benefit costs. Service cost will be presented with other employee compensation cost within “Operating costs”. The other components of net periodic benefit costs, such as interest cost, amortization of prior service cost and gains or losses are required to be presented outside of operations. The new guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The guidance should be applied retrospectively for the presentation of the service cost component in the income statement and allows a practical expedient for the estimation basis for applying the retrospective presentation requirements. Since ASU 2017-07 only requires change to the Condensed Consolidated Statements of Operations classification of the components of net periodic benefit cost, there are no changes to income from continuing operations or net income. As a result of the adoption of the ASU during the first quarter of 2018, the service cost component of net periodic benefit costs continues to be recognized in total operating costs and the other components of net periodic benefit costs have been reclassified to “Other components of net periodic benefit costs/(income)” in the Condensed Consolidated Statements of Operations below “Operating profit” on a retrospective basis. The Company reclassified $0.1 million and $1.1 million of credits from “Production costs” and “Selling and general and administrative costs”, respectively, to “Other components of net periodic benefit costs/(income)” in the first quarter of 2017. See Note 10 for the components of net periodic benefit costs/(income) for our pension and other postretirement benefits plans. In November 2016, the FASB issued ASU 2016-18, “Statement of Cash Flow: Restricted Cash,” which amends the guidance in Accounting Standards Codification (“ASC”) 230 on the classification and presentation of restricted cash in the statement of cash flows. The key requirements of the ASU are: (1) all entities should include in their cash and cash-equivalent balances in the statements of cash flows those amounts that are deemed to be restricted cash and restricted cash equivalents, (2) a reconciliation between the statement of financial position and the statement of cash flows must be disclosed when the statement of financial position includes more than one line item for cash, cash equivalents, and restricted cash, (3) changes in restricted cash that result from transfers between cash, cash equivalents, and restricted cash should not be presented as cash flow activities in the statement of cash flows, and (4) an entity with a material balance of amounts generally described as restricted cash must disclose information about the nature of the restrictions. This guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. As a result of the adoption of ASU 2016-18 in the first quarter of 2018, the Company included the restricted cash balance with the cash and cash equivalents balances in the Condensed Consolidated Statements of Cash Flows on a retrospective basis. The reclassification did not have a material impact to the Condensed Consolidated Statement of Cash Flows for the first quarter of 2017. The Company has added a reconciliation from the Condensed Consolidated Balance Sheets to the Condensed Consolidated Statement of Cash Flows in the first quarter of 2018. See Note 8 for more information. In January 2016, the FASB issued ASU 2016-01, “Financial Instruments—Overall: Recognition and Measurement of Financial Assets and Financial Liabilities,” which addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments, including requirements to measure most equity investments at fair value with changes in fair value recognized in net income, to perform a qualitative assessment of equity investments without readily determinable fair values, and to separately present financial assets and liabilities by measurement category and by type of financial asset on the balance sheet or the accompanying notes to the financial statements. The new guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Subsequently, in February 2018, the FASB issued ASU 2018-03, “Technical Corrections and Improvements to Financial Instruments, Recognition and Measurement of Financial Assets and Financial Liabilities,” which provided several clarifications and amendments to the standard. These include specifying that for equity instruments without readily determinable fair values for which the measurement alternative is applied: (i) adjustments made when an observable transaction occurs for a similar security are intended to reflect the fair value as of the observable transaction date, not as of current reporting date; (ii) the measurement alternative may be discontinued upon an irrevocable election to change to a fair value measurement approach under fair value guidance, which would apply to all identical and similar investments of the same issuer; and (iii) the prospective transition approach for equity securities without readily determinable fair values is applicable only when the measurement alternative is applied. The new guidance must be adopted by the third quarter of 2018 (an interim period). Early adoption of the new guidance is permitted. We have adopted ASU 2016-01 in the first quarter of 2018 and elected the measurement alternative, defined as cost, less impairments, adjusted by observable price changes given our equity instruments are without readily determinable fair values. This guidance did not impact our available-for-sale (“AFS”) securities because we only hold debt securities. We also early adopted ASU 2018-03 in the first quarter of 2018. The adoptions of ASU 2016-01 and ASU 2018-03 did not have a material effect on our Condensed Consolidated Financial Statements. See Note 6 for more information. In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606),” which prescribes a single comprehensive model for entities to use in the accounting of revenue arising from contracts with customers. The new guidance supersedes virtually all existing revenue guidance under GAAP and is effective for fiscal years beginning after December 31, 2017. There are two transition options available to entities: the full retrospective approach or the modified retrospective approach. Under the full retrospective approach, the Company would restate prior periods in compliance with ASC 250, “Accounting Changes and Error Corrections.” Alternatively, the Company may elect the modified retrospective approach, which allows for the new revenue standard to be applied to existing contracts as of the effective date with a cumulative catch-up adjustment recorded to retained earnings. Subsequently, in March 2016, the FASB issued ASU 2016-08, “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net),” which clarifies the implementation guidance on principal versus agent considerations in ASU 2014-09. In April 2016, the FASB also issued ASU 2016-10, “Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing,” to reduce the cost and complexity of applying the guidance on identifying promised goods or services when identifying a performance obligation and improve the operability and understandability of the licensing implementation guidance. In May 2016, the FASB issued ASU 2016-12, “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients,” to reduce the cost and complexity of applying the guidance to address certain issues on assessing collectability, presentation of sales taxes, noncash consideration, and completed contracts and contract modifications at transition. The clarifying amendments in ASU 2016-08, 2016-10, and 2016-12 do not change the core principle of ASU 2014-09. We refer to ASU 2014-09 and the clarifying amendments collectively as “Topic 606.” On January 1, 2018, the Company adopted Topic 606, Revenue from Contracts with Customers. The Company has elected the modified retrospective approach, which allows for the new revenue standard to be applied to all existing contracts as of the effective date and a cumulative catch-up adjustment to be recorded to “Retained earnings”. The Company recognizes revenue under the core principle to depict the transfer of control to the Company’s customers in an amount reflecting the consideration the Company expects to be entitled. In order to achieve that core principle, the Company applies the following five-step approach: (1) identify the contract with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenue when a performance obligation is satisfied. The most significant change to the Company’s accounting practices related to accounting for certain licensing arrangements in the other revenue category for which archival and updated content is included. Under the former revenue guidance, licensing revenue was generally recognized over the term of the contract based on the annual minimum guarantee amount specified in the contractual agreement with the licensee as a single deliverable. Based on the guidance of Topic 606, the Company has determined that the archival content and updated content included in these licensing arrangements represent two separate performance obligations. As such, a portion of the total contract consideration related to the archival content was recognized at the commencement of the contract when control of the archival content is transferred. The remaining contractual consideration will be recognized proportionately over the term of the contract when updated content is transferred to the licensee, in line with when the control of the new content is transferred. The net impact of these changes accelerated the revenue of contracts not completed as of January 1, 2018. In connection with the adoption of the standard the Company recorded a net increase to opening retained earnings of $2.6 million ($3.5 million before tax) and a contract asset of $3.5 million, $1.3 million categorized as a current asset and $2.2 million categorized as a long term asset as of January 1, 2018. The impact to “Other revenues” as a result of applying Topic 606 will be a decrease of $1.3 million for the twelve months ended December 30, 2018. Our subscription and advertising revenues were not impacted by the new guidance. See Note 3 for more information on our revenues and the application of Topic 606. Recently Issued Accounting Pronouncements In June 2016, the FASB issued ASU 2016-13, “Financial Instruments—Credit Losses.” The new guidance introduces an approach based on expected losses to estimate credit losses on certain types of financial instruments. It also modifies the impairment model AFS debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. The new guidance is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. We are currently in the process of evaluating the impact of this guidance on our consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, “Leases,” which provides guidance on accounting for leases and disclosure of key information about leasing arrangements. The guidance requires lessees to recognize the following for all operating and finance leases at the commencement date: (1) a lease liability, which is the obligation to make lease payments arising from a lease, measured on a discounted basis, and (2) a right-of-use asset representing the lessee’s right to use, or control the use of, the underlying asset for the lease term. A lessee is permitted to make an accounting policy election not to recognize lease assets and lease liabilities for short-term leases with a term of 12 months or less. The guidance does not fundamentally change lessor accounting; however, some changes have been made to align that guidance with the lessee guidance and other areas within GAAP. This guidance becomes effective for the Company for fiscal years beginning after December 30, 2018. Early application is permitted. This guidance will be applied on a modified retrospective basis for leases existing at, or entered into after, the earliest period presented in the financial statements. We are currently in the process of evaluating the impact of the new leasing guidance and expect that most of our lease commitments will be subject to the new standard. The adoption of the standard will require us to add right-of-use assets and lease liabilities onto our balance sheet. Based upon our initial evaluation, we do not expect the adoption of the standard to have a material effect on our results of operations or the Company’s liquidity. The Company considers the applicability and impact of all recently issued accounting pronouncements. Recent accounting pronouncements not specifically identified in our disclosures are either not applicable to the Company or are not expected to have a material effect on our financial condition or results of operations.

Recently Adopted Accounting Pronouncements

In March 2018, the Financial Accounting Standards Board (“FASB”) issued ASU 2018-05, which amends ASC Topic 740 “Income Taxes” to conform with SEC Staff Accounting Bulletin 118, issued in December 2017 which allowed SEC registrants to record provisional amounts for the year ended December 31, 2017, due to the complexities involved in accounting for the enactment of the 2017 Tax Cuts and Jobs Act (the “Act”). The standard is effective upon issuance. During the three months ended April 1, 2018, we have not recorded any measurement period adjustments to the provisional estimate recorded at December 31, 2017, for the Act. The accounting for the impact of the Act is expected to be completed by the fourth quarter of this year.

In February 2018, the FASB issued Accounting Standards Update (“ASU”) 2018-02, “Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” The new guidance provides financial statement preparers with an option to reclassify stranded tax effects within accumulated other comprehensive income (“AOCI”) to retained earnings in each period in which the effect of the change in the U.S. federal corporate income tax rate related to the Tax Cuts and Jobs Act is recorded. The amendments are effective for all organizations for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The Company elected to adopt this guidance to reclassify the stranded tax effects from AOCI to retained earnings in the first quarter of 2018. Our current accounting policy related to releasing tax effects from AOCI for pension and other postretirement benefits is a plan by plan approach. Accordingly, the Company recorded a $94.1 million cumulative effect adjustment for stranded tax effects, such as pension and other postretirement benefits, to “Retained earnings” on January 1, 2018. See Note 13 for more information.

In March 2017, the FASB issued ASU 2017-07, “Compensation—Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.” The new guidance requires the service cost component to be presented separately from the other components of net benefit costs. Service cost will be presented with other employee compensation cost within “Operating costs”. The other components of net periodic benefit costs, such as interest cost, amortization of prior service cost and gains or losses are required to be presented outside of operations. The new guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The guidance should be applied retrospectively for the presentation of the service cost component in the income statement and allows a practical expedient for the estimation basis for applying the retrospective presentation requirements.

Since ASU 2017-07 only requires change to the Condensed Consolidated Statements of Operations classification of the components of net periodic benefit cost, there are no changes to income from continuing operations or net income. As a result of the adoption of the ASU during the first quarter of 2018, the service cost component of net periodic benefit costs continues to be recognized in total operating costs and the other components of net periodic benefit costs have been reclassified to “Other components of net periodic benefit costs/(income)” in the Condensed Consolidated Statements of Operations below “Operating profit” on a retrospective basis. The Company reclassified $0.1 million and $1.1 million of credits from “Production costs” and “Selling and general and administrative costs”, respectively, to “Other components of net periodic benefit costs/(income)” in the first quarter of 2017. See Note 10 for the components of net periodic benefit costs/(income) for our pension and other postretirement benefits plans.

In November 2016, the FASB issued ASU 2016-18, “Statement of Cash Flow: Restricted Cash,” which amends the guidance in Accounting Standards Codification (“ASC”) 230 on the classification and presentation of restricted cash in the statement of cash flows. The key requirements of the ASU are: (1) all entities should include in their cash and cash-equivalent balances in the statements of cash flows those amounts that are deemed to be restricted cash and restricted cash equivalents, (2) a reconciliation between the statement of financial position and the statement of cash flows must be disclosed when the statement of financial position includes more than one line item for cash, cash equivalents, and restricted cash, (3) changes in restricted cash that result from transfers between cash, cash equivalents, and restricted cash should not be presented as cash flow activities in the statement of cash flows, and (4) an entity with a material balance of amounts generally described as restricted cash must disclose information about the nature of the restrictions. This guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted.

As a result of the adoption of ASU 2016-18 in the first quarter of 2018, the Company included the restricted cash balance with the cash and cash equivalents balances in the Condensed Consolidated Statements of Cash Flows on a retrospective basis. The reclassification did not have a material impact to the Condensed Consolidated Statement of Cash Flows for the first quarter of 2017. The Company has added a reconciliation from the Condensed Consolidated Balance Sheets to the Condensed Consolidated Statement of Cash Flows in the first quarter of 2018. See Note 8 for more information.

In January 2016, the FASB issued ASU 2016-01, “Financial Instruments—Overall: Recognition and Measurement of Financial Assets and Financial Liabilities,” which addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments, including requirements to measure most equity investments at fair value with changes in fair value recognized in net income, to perform a qualitative assessment of equity investments without readily determinable fair values, and to separately present financial assets and liabilities by measurement category and by type of financial asset on the balance sheet or the accompanying notes to the financial statements. The new guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years.

Subsequently, in February 2018, the FASB issued ASU 2018-03, “Technical Corrections and Improvements to Financial Instruments, Recognition and Measurement of Financial Assets and Financial Liabilities,” which provided several clarifications and amendments to the standard. These include specifying that for equity instruments without readily determinable fair values for which the measurement alternative is applied: (i) adjustments made when an observable transaction occurs for a similar security are intended to reflect the fair value as of the observable transaction date, not as of current reporting date; (ii) the measurement alternative may be discontinued upon an irrevocable election to change to a fair value measurement approach under fair value guidance, which would apply to all identical and similar investments of the same issuer; and (iii) the prospective transition approach for equity securities without readily determinable fair values is applicable only when the measurement alternative is applied. The new guidance must be adopted by the third quarter of 2018 (an interim period). Early adoption of the new guidance is permitted.

We have adopted ASU 2016-01 in the first quarter of 2018 and elected the measurement alternative, defined as cost, less impairments, adjusted by observable price changes given our equity instruments are without readily determinable fair values. This guidance did not impact our available-for-sale (“AFS”) securities because we only hold debt securities. We also early adopted ASU 2018-03 in the first quarter of 2018. The adoptions of ASU 2016-01 and ASU 2018-03 did not have a material effect on our Condensed Consolidated Financial Statements. See Note 6 for more information.

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606),” which prescribes a single comprehensive model for entities to use in the accounting of revenue arising from contracts with customers. The new guidance supersedes virtually all existing revenue guidance under GAAP and is effective for fiscal years beginning after December 31, 2017. There are two transition options available to entities: the full retrospective approach or the modified retrospective approach. Under the full retrospective approach, the Company would restate prior periods in compliance with ASC 250, “Accounting Changes and Error Corrections.” Alternatively, the Company may elect the modified retrospective approach, which allows for the new revenue standard to be applied to existing contracts as of the effective date with a cumulative catch-up adjustment recorded to retained earnings.

Subsequently, in March 2016, the FASB issued ASU 2016-08, “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net),” which clarifies the implementation guidance on principal versus agent considerations in ASU 2014-09. In April 2016, the FASB also issued ASU 2016-10, “Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing,” to reduce the cost and complexity of applying the guidance on identifying promised goods or services when identifying a performance obligation and improve the operability and understandability of the licensing implementation guidance. In May 2016, the FASB issued ASU 2016-12, “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients,” to reduce the cost and complexity of applying the guidance to address certain issues on assessing collectability, presentation of sales taxes, noncash consideration, and completed contracts and contract modifications at transition. The clarifying amendments in ASU 2016-08, 2016-10, and 2016-12 do not change the core principle of ASU 2014-09. We refer to ASU 2014-09 and the clarifying amendments collectively as “Topic 606.”

On January 1, 2018, the Company adopted Topic 606, Revenue from Contracts with Customers. The Company has elected the modified retrospective approach, which allows for the new revenue standard to be applied to all existing contracts as of the effective date and a cumulative catch-up adjustment to be recorded to “Retained earnings”. The Company recognizes revenue under the core principle to depict the transfer of control to the Company’s customers in an amount reflecting the consideration the Company expects to be entitled. In order to achieve that core principle, the Company applies the following five-step approach: (1) identify the contract with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenue when a performance obligation is satisfied.

The most significant change to the Company’s accounting practices related to accounting for certain licensing arrangements in the other revenue category for which archival and updated content is included. Under the former revenue guidance, licensing revenue was generally recognized over the term of the contract based on the annual minimum guarantee amount specified in the contractual agreement with the licensee as a single deliverable. Based on the guidance of Topic 606, the Company has determined that the archival content and updated content included in these licensing arrangements represent two separate performance obligations. As such, a portion of the total contract consideration related to the archival content was recognized at the commencement of the contract when control of the archival content is transferred. The remaining contractual consideration will be recognized proportionately over the term of the contract when updated content is transferred to the licensee, in line with when the control of the new content is transferred.

The net impact of these changes accelerated the revenue of contracts not completed as of January 1, 2018. In connection with the adoption of the standard the Company recorded a net increase to opening retained earnings of $2.6 million ($3.5 million before tax) and a contract asset of $3.5 million, $1.3 million categorized as a current asset and $2.2 million categorized as a long term asset as of January 1, 2018. The impact to “Other revenues” as a result of applying Topic 606 will be a decrease of $1.3 million for the twelve months ended December 30, 2018.

Our subscription and advertising revenues were not impacted by the new guidance. See Note 3 for more information on our revenues and the application of Topic 606.

Recently Issued Accounting Pronouncements

In June 2016, the FASB issued ASU 2016-13, “Financial Instruments—Credit Losses.” The new guidance introduces an approach based on expected losses to estimate credit losses on certain types of financial instruments. It also modifies the impairment model AFS debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. The new guidance is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. We are currently in the process of evaluating the impact of this guidance on our consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, “Leases,” which provides guidance on accounting for leases and disclosure of key information about leasing arrangements. The guidance requires lessees to recognize the following for all operating and finance leases at the commencement date: (1) a lease liability, which is the obligation to make lease payments arising from a lease, measured on a discounted basis, and (2) a right-of-use asset representing the lessee’s right to use, or control the use of, the underlying asset for the lease term. A lessee is permitted to make an accounting policy election not to recognize lease assets and lease liabilities for short-term leases with a term of 12 months or less. The guidance does not fundamentally change lessor accounting; however, some changes have been made to align that guidance with the lessee guidance and other areas within GAAP. This guidance becomes effective for the Company for fiscal years beginning after December 30, 2018. Early application is permitted. This guidance will be applied on a modified retrospective basis for leases existing at, or entered into after, the earliest period presented in the financial statements. We are currently in the process of evaluating the impact of the new leasing guidance and expect that most of our lease commitments will be subject to the new standard. The adoption of the standard will require us to add right-of-use assets and lease liabilities onto our balance sheet. Based upon our initial evaluation, we do not expect the adoption of the standard to have a material effect on our results of operations or the Company’s liquidity.

The Company considers the applicability and impact of all recently issued accounting pronouncements. Recent accounting pronouncements not specifically identified in our disclosures are either not applicable to the Company or are not expected to have a material effect on our financial condition or results of operations.