Other Postretirement Benefits - Other Information (Details) (USD $)	12 Months Ended			3 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012	Mar. 25, 2012	Dec. 28, 2014
Other Postretirement Benefits
Postemployment benefits liability	$ 15,900,000	$ 16,200,000			$ 15,900,000
Unrecognized prior service cost due to change in plan provisions	(25,500,000)
Unrecognized (gain)/loss due to change in discount rate	3,600,000
Total effect of other postretirement benefit changes	21,900,000
Other Postretirement Benefit Plans, Defined Benefit [Member]
Other Postretirement Benefits
Effect of curtailment	0	49,122,000	27,213,000
Regional Media Group [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Other Postretirement Benefits
Effect of curtailment				27,200,000
New England Media Group [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Other Postretirement Benefits
Effect of curtailment		$ 49,100,000			$ 49,100,000