Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 25, 2017	Jun. 25, 2017	Jun. 26, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Single-copy sales of print products as percentage of subscription revenues (percent)	10.00%
Net cash used in financing activities		$ (14,342)	$ (38,137)
Net cash provided/(used) by operating activities		99,461	$ 40,791
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax windfalls for share-based payments	$ 1,600	100
Net cash used in financing activities		8,700
Net cash provided/(used) by operating activities		$ (9,300)

Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit (Shortfall), Amount

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- Definition

Single Copy Sales of Print Products as Percent of Subscription Revenues

+ References

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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- Definition

Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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