Name:	mso_AvailableforsaleDebtSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
Namespace Prefix:	mso_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

No definition available.

Name:	mso_AvailableforsaleDebtSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
Namespace Prefix:	mso_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Available-for-Sale Securities, Contractual Maturity

No definition available.

Name:	mso_AvailableforSaleSecuritiesContractualMaturity
Namespace Prefix:	mso_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

Name:	us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.