Facility consolidation and asset impairment charges (Details Textual) (USD $)	9 Months Ended	3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended	3 Months Ended
	Sep. 28, 2014	Sep. 28, 2014 Broadcast and publishing member [Member] Property Plant And Equipment [Member]	Sep. 29, 2013 Broadcast and publishing member [Member] Property Plant And Equipment [Member]	Sep. 28, 2014 Broadcast and publishing member [Member] Property Plant And Equipment [Member]	Sep. 29, 2013 Broadcast and publishing member [Member] Property Plant And Equipment [Member]	Sep. 28, 2014 Publishing [Member]	Mar. 31, 2013 Publishing [Member] Publishing Assets Donated [Member]	Sep. 28, 2014 Broadcasting [Member]	Jun. 29, 2014 Broadcasting [Member] Broadcasting Assets Donated [Member]	Sep. 28, 2014 Fair Value, Measurements, Nonrecurring [Member]
Unusual or Infrequent Item [Line Items]
Goodwill, Fair Value Disclosure										$ 6,200,000
Goodwill, Impairment Loss	15,310,000					15,310,000		0
Facility consolidation and asset impairment charges (Textual) [Abstract]
Asset impairment and other charges, pre-tax amount		$ 6,600,000	$ 5,900,000	$ 50,200,000	$ 15,200,000		$ 900,000		$ 1,000,000