REVENUES - Practical Expedients and Exemptions (Details)	3 Months Ended
Apr. 01, 2018
REVENUES
Practical expedient incremental cost of obtaining contract	true
Practical expedient, remaining performance obligation	true

Indicates (true/false) whether practical expedient is elected not to disclose amount of transaction price allocated to remaining performance obligation and explanation of expected timing of revenue recognition, when contract has expected duration of one year or less or right to consideration corresponds directly to performance completed.

No definition available.

Name:	mni_RevenuePracticalExpedientRemainingPerformanceObligationTrueFalse
Namespace Prefix:	mni_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration