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COMMITMENTS AND CONTINGENCIES - Legal proceedings (Details)
 12 Months Ended
Dec. 28, 2014
item
"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