Consolidated Statements of Income (Unaudited) Parenthetical Disclosure (USD $) In Millions, unless otherwise specified	3 Months Ended
Jun. 30, 2013
Income Statement [Abstract]
Accumulated other comprehensive income reclassifications for foreign currency translation adjustment	$ (75)

Discontinued Operations, Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax

No definition available.

Name:	mhp_DiscontinuedOperationsAccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Namespace Prefix:	mhp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration