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COMMITMENTS AND CONTINGENCIES (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended 1 Months Ended
Feb. 28, 2009
item
Mar. 29, 2015
item
Dec. 31, 2008
item
Letter of credit      
Additional disclosures      
Outstanding letters of credit   33.2us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember		  
"Sacramento Case"      
Contingencies      
Number of carriers 5,000us-gaap_LossContingencyNumberOfPlaintiffs
/ us-gaap_LitigationCaseAxis
= mni_SacramentoCaseMember		    
Number of phases   3mni_NumberOfPhasesInTrial
/ us-gaap_LitigationCaseAxis
= mni_SacramentoCaseMember		  
"Fresno Case"      
Contingencies      
Number of carriers     3,500us-gaap_LossContingencyNumberOfPlaintiffs
/ us-gaap_LitigationCaseAxis
= mni_FresnoCaseMember
Number of phases   2mni_NumberOfPhasesInTrial
/ us-gaap_LitigationCaseAxis
= mni_FresnoCaseMember