1.0.0.3 true Consolidated Statements of Stockholders' Equity (USD $) In Millions, except Share data in Thousands false 1 $ true false false false Common Stock [Member] us-gaap_StatementEquityComponentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_CommonStockMember us-gaap_StatementEquityComponentsAxis explicitMember Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 false 2 $ true false false false Treasury Stock [Member] us-gaap_StatementEquityComponentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_TreasuryStockMember us-gaap_StatementEquityComponentsAxis explicitMember Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 false 3 $ true false false false Accumulated Other Comprehensive Income (Loss) [Member] us-gaap_StatementEquityComponentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_AccumulatedOtherComprehensiveIncomeMember us-gaap_StatementEquityComponentsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 false 4 $ true false false false Additional Paid-in Capital [Member] us-gaap_StatementEquityComponentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_AdditionalPaidInCapitalMember us-gaap_StatementEquityComponentsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 false 5 $ true false false false Retained Earnings [Member] us-gaap_StatementEquityComponentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_RetainedEarningsMember us-gaap_StatementEquityComponentsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 false 6 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 6 Balances, value at Dec. 30, 2006 4 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap true credit instant monetary No definition available. false false false true false false true false false 1 true true 6300000 6.3 [3] true false 2 true true -1556300000 -1556.3 true false 3 true true 15300000 15.3 true false 4 true true 7153100000 7153.1 [3] true false 5 true true 1885100000 1885.1 true false 6 true true 7503500000 7503.5 false false No definition available. No authoritative reference available. false 7 Shares balances at Dec. 30, 2006 4 us-gaap_SharesIssued us-gaap true na instant shares No definition available. false false false true false false true false false 1 false true 635019000 635019 [3] true false 2 false true 58122000 58122 [3] true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. No authoritative reference available. false 5 Comprehensive income: 3 us-gaap_IncreaseDecreaseInStockholdersEquityRollForward us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. false 8 Net income 4 us-gaap_ProfitLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true 912000000 912.0 true false 6 false true 912000000 912.0 false false No definition available. No authoritative reference available. true 9 Other comprehensive income (loss): 4 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. false 12 Unrealized loss on cash flow hedge, net of tax 5 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true 4800000 4.8 [2] true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true 4800000 4.8 [2] false false No definition available. No authoritative reference available. false 15 Defined benefit plans, net of tax: 5 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. false 16 Net prior service cost 6 us-gaap_OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true -4500000 -4.5 [2] true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true -4500000 -4.5 [2] false false No definition available. No authoritative reference available. false 17 Net gain (loss) 6 us-gaap_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true 400000 0.4 [2] true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true 400000 0.4 [2] false false No definition available. No authoritative reference available. true 18 Other comprehensive income (loss) 5 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true -8900000 -8.9 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true -8900000 -8.9 false false No definition available. No authoritative reference available. true 19 Total comprehensive income 4 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true -8900000 -8.9 true false 4 false false 0 0 true false 5 false true 912000000 912.0 true false 6 false true 903100000 903.1 false false No definition available. No authoritative reference available. false 20 Adoption of FASB standard on accounting for uncertainty in income taxes 4 us-gaap_CumulativeEffectOfInitialAdoptionOfFIN48 us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true 29300000 29.3 [1] true false 6 false true 29300000 29.3 [1] false false No definition available. No authoritative reference available. false 21 Stock option activity, including tax benefit, value 4 mhs_StockOptionActivityIncludingTaxBenefitValue mhs false credit duration monetary This element represents the amount of recognized share-based compensation during the period, that is, the amount recognized... false false false false false false false false false 1 false true 100000 0.1 [3] true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 334700000 334.7 [3] true false 5 false false 0 0 true false 6 false true 334800000 334.8 false false This element represents the amount of recognized share-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized), as well as the value of stock issued during the period as a result of the exercise of stock options. Additionally, this element represents the tax benefit associated with Stock Options. The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits). No authoritative reference available. false 22 Stock option activity, including tax benefit, shares 4 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised us-gaap true na duration shares No definition available. false false false false false false false false false 1 false true 11876000 11876 [3] true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. No authoritative reference available. false 23 Issuance of common stock under employee stock purchase plan, value 4 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 13000000 13.0 [3] true false 5 false false 0 0 true false 6 false true 13000000 13.0 false false No definition available. No authoritative reference available. false 24 Issuance of common stock under employee stock purchase plan, shares 5 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans us-gaap true na duration shares No definition available. false false false false false false false false false 1 false true 365000 365 [3] true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. No authoritative reference available. false 25 Restricted stock and restricted stock unit activity, including tax benefit, value 4 mhs_RestrictedStockAndRestrictedStockUnitActivityIncludingTaxBenefitValue mhs false credit duration monetary This element represents the amount of recognized share-based compensation during the period, that is, the amount recognized... false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 52200000 52.2 [3] true false 5 false false 0 0 true false 6 false true 52200000 52.2 false false This element represents the amount of recognized share-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized), as well as value of stock related to Restricted Stock and Restricted Stock Units issued during the period, net of the stock value of such awards forfeited. Additionally, this element represents the tax benefit associated with Restricted Stock and Restricted Stock Units. The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits). No authoritative reference available. false 26 Restricted stock and restricted stock unit activity, including tax benefit, shares 4 mhs_RestrictedStockAndRestrictedStockUnitActivityIncludingTaxBenefitShares mhs false na duration shares This element represents the amount of recognized share-based compensation during the period, that is, the amount recognized... false false false false false false false false false 1 false true 125000 125 [3] true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false This element represents the amount of recognized share-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized), as well as shares related to Restricted Stock and Restricted Stock Units issued during the period, net of the shares of such awards forfeited. Additionally, this element represents the tax benefit associated with Restricted Stock and Restricted Stock Units. The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits). No authoritative reference available. false 29 Treasury stock acquired, value 4 us-gaap_TreasuryStockValueAcquiredCostMethod us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false true -1960600000 -1960.6 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true -1960600000 -1960.6 false false No definition available. No authoritative reference available. false 30 Treasury stock acquired, shares 4 us-gaap_TreasuryStockSharesAcquired us-gaap true na duration shares No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false true 53323000 53323 [3] true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. No authoritative reference available. true 31 Shares balances at Dec. 29, 2007 4 us-gaap_SharesIssued us-gaap true na instant shares No definition available. false false false true false false false true false 1 false true 647385000 647385 [3] true false 2 false true 111445000 111445 [3] true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. No authoritative reference available. false 32 Balances, value at Dec. 29, 2007 4 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap true credit instant monetary No definition available. false false false true false false false true false 1 false true 6400000 6.4 [3] true false 2 false true -3516900000 -3516.9 true false 3 false true 6400000 6.4 true false 4 false true 7553000000 7553.0 [3] true false 5 false true 2826400000 2826.4 true false 6 false true 6875300000 6875.3 false false No definition available. No authoritative reference available. false 5 Comprehensive income: 3 us-gaap_IncreaseDecreaseInStockholdersEquityRollForward us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. false 8 Net income 4 us-gaap_ProfitLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true 1102900000 1102.9 true false 6 false true 1102900000 1102.9 false false No definition available. No authoritative reference available. true 9 Other comprehensive income (loss): 4 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. false 10 Unrealized loss on investments, net of tax 5 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true -200000 -0.2 [2] true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true -200000 -0.2 [2] false false No definition available. No authoritative reference available. false 11 Foreign currency translation gain (loss) 5 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true -15500000 -15.5 [2] true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true -15500000 -15.5 [2] false false No definition available. No authoritative reference available. false 14 Unrealized loss on cash flow hedge, net of amortization, net of tax 5 us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true -15200000 -15.2 [2] true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true -15200000 -15.2 [2] false false No definition available. No authoritative reference available. false 15 Defined benefit plans, net of tax: 5 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. false 16 Net prior service cost 6 us-gaap_OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true -3000000 -3.0 [2] true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true -3000000 -3.0 [2] false false No definition available. No authoritative reference available. false 17 Net gain (loss) 6 us-gaap_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true -36300000 -36.3 [2] true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true -36300000 -36.3 [2] false false No definition available. No authoritative reference available. true 18 Other comprehensive income (loss) 5 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true -70200000 -70.2 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true -70200000 -70.2 false false No definition available. No authoritative reference available. true 19 Total comprehensive income 4 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true -70200000 -70.2 true false 4 false false 0 0 true false 5 false true 1102900000 1102.9 true false 6 false true 1032700000 1032.7 false false No definition available. No authoritative reference available. false 21 Stock option activity, including tax benefit, value 4 mhs_StockOptionActivityIncludingTaxBenefitValue mhs false credit duration monetary This element represents the amount of recognized share-based compensation during the period, that is, the amount recognized... false false false false false false false false false 1 false true 100000 0.1 [3] true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 167600000 167.6 [3] true false 5 false false 0 0 true false 6 false true 167700000 167.7 false false This element represents the amount of recognized share-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized), as well as the value of stock issued during the period as a result of the exercise of stock options. Additionally, this element represents the tax benefit associated with Stock Options. The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits). No authoritative reference available. false 22 Stock option activity, including tax benefit, shares 4 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised us-gaap true na duration shares No definition available. false false false false false false false false false 1 false true 3444000 3444 [3] true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. No authoritative reference available. false 23 Issuance of common stock under employee stock purchase plan, value 4 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 18700000 18.7 [3] true false 5 false false 0 0 true false 6 false true 18700000 18.7 false false No definition available. No authoritative reference available. false 24 Issuance of common stock under employee stock purchase plan, shares 5 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans us-gaap true na duration shares No definition available. false false false false false false false false false 1 false true 400000 400 [3] true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. No authoritative reference available. false 25 Restricted stock and restricted stock unit activity, including tax benefit, value 4 mhs_RestrictedStockAndRestrictedStockUnitActivityIncludingTaxBenefitValue mhs false credit duration monetary This element represents the amount of recognized share-based compensation during the period, that is, the amount recognized... false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 49600000 49.6 [3] true false 5 false false 0 0 true false 6 false true 49600000 49.6 false false This element represents the amount of recognized share-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized), as well as value of stock related to Restricted Stock and Restricted Stock Units issued during the period, net of the stock value of such awards forfeited. Additionally, this element represents the tax benefit associated with Restricted Stock and Restricted Stock Units. The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits). No authoritative reference available. false 26 Restricted stock and restricted stock unit activity, including tax benefit, shares 4 mhs_RestrictedStockAndRestrictedStockUnitActivityIncludingTaxBenefitShares mhs false na duration shares This element represents the amount of recognized share-based compensation during the period, that is, the amount recognized... false false false false false false false false false 1 false true 1158000 1158 [3] true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false This element represents the amount of recognized share-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized), as well as shares related to Restricted Stock and Restricted Stock Units issued during the period, net of the shares of such awards forfeited. Additionally, this element represents the tax benefit associated with Restricted Stock and Restricted Stock Units. The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits). No authoritative reference available. false 29 Treasury stock acquired, value 4 us-gaap_TreasuryStockValueAcquiredCostMethod us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false true -2186100000 -2186.1 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true -2186100000 -2186.1 false false No definition available. No authoritative reference available. false 30 Treasury stock acquired, shares 4 us-gaap_TreasuryStockSharesAcquired us-gaap true na duration shares No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false true 47616000 47616 [3] true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. No authoritative reference available. true 31 Shares balances at Dec. 27, 2008 4 us-gaap_SharesIssued us-gaap true na instant shares No definition available. false false false true false false false true false 1 false true 652387000 652387 [3] true false 2 false true 159061000 159061 [3] true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. No authoritative reference available. false 32 Balances, value at Dec. 27, 2008 4 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap true credit instant monetary No definition available. false false false true false false false true false 1 false true 6500000 6.5 [3] true false 2 false true -5703000000 -5703.0 true false 3 false true -63800000 -63.8 true false 4 false true 7788900000 7788.9 [3] true false 5 false true 3929300000 3929.3 true false 6 false true 5957900000 5957.9 false false No definition available. No authoritative reference available. false 5 Comprehensive income: 3 us-gaap_IncreaseDecreaseInStockholdersEquityRollForward us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. false 8 Net income 4 us-gaap_ProfitLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false true 1280300000 1280.3 true false 6 false true 1280300000 1280.3 false false No definition available. No authoritative reference available. true 9 Other comprehensive income (loss): 4 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. false 10 Unrealized loss on investments, net of tax 5 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true -100000 -0.1 [2] true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true -100000 -0.1 [2] false false No definition available. No authoritative reference available. false 11 Foreign currency translation gain (loss) 5 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true 2900000 2.9 [2] true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true 2900000 2.9 [2] false false No definition available. No authoritative reference available. false 13 Amortization of unrealized loss on cash flow hedge, net of tax 5 us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true 1900000 1.9 [2] true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true 1900000 1.9 [2] false false No definition available. No authoritative reference available. false 15 Defined benefit plans, net of tax: 5 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. false 16 Net prior service cost 6 us-gaap_OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true -2400000 -2.4 [2] true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true -2400000 -2.4 [2] false false No definition available. No authoritative reference available. false 17 Net gain (loss) 6 us-gaap_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true 17300000 17.3 [2] true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true 17300000 17.3 [2] false false No definition available. No authoritative reference available. true 18 Other comprehensive income (loss) 5 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true 19600000 19.6 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true 19600000 19.6 false false No definition available. No authoritative reference available. true 19 Total comprehensive income 4 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false true 19600000 19.6 true false 4 false false 0 0 true false 5 false true 1280300000 1280.3 true false 6 false true 1299900000 1299.9 false false No definition available. No authoritative reference available. false 21 Stock option activity, including tax benefit, value 4 mhs_StockOptionActivityIncludingTaxBenefitValue mhs false credit duration monetary This element represents the amount of recognized share-based compensation during the period, that is, the amount recognized... false false false false false false false false false 1 false true 100000 0.1 [3] true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 298400000 298.4 [3] true false 5 false false 0 0 true false 6 false true 298500000 298.5 false false This element represents the amount of recognized share-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized), as well as the value of stock issued during the period as a result of the exercise of stock options. Additionally, this element represents the tax benefit associated with Stock Options. The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits). No authoritative reference available. false 22 Stock option activity, including tax benefit, shares 4 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised us-gaap true na duration shares No definition available. false false false false false false false false false 1 false true 6997000 6997 [3] true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. No authoritative reference available. false 23 Issuance of common stock under employee stock purchase plan, value 4 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 20800000 20.8 [3] true false 5 false false 0 0 true false 6 false true 20800000 20.8 false false No definition available. No authoritative reference available. false 24 Issuance of common stock under employee stock purchase plan, shares 5 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans us-gaap true na duration shares No definition available. false false false false false false false false false 1 false true 461000 461 [3] true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. No authoritative reference available. false 27 Restricted stock unit activity, including tax benefit, value 4 mhs_RestrictedStockUnitActivityIncludingTaxBenefitValue mhs false credit duration monetary This element represents the amount of recognized share-based compensation during the period, that is, the amount recognized... false false false false false false false false false 1 false false 0 0 true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false true 48600000 48.6 [3] true false 5 false false 0 0 true false 6 false true 48600000 48.6 false false This element represents the amount of recognized share-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized), as well as value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited. Additionally, this element represents the tax benefit associated with Restricted Stock Awards. The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits). No authoritative reference available. false 28 Restricted stock unit activity, including tax benefit, shares 4 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures us-gaap true na duration shares No definition available. false false false false false false false false false 1 false true 1002000 1002 [3] true false 2 false false 0 0 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. No authoritative reference available. true 29 Treasury stock acquired, value 4 us-gaap_TreasuryStockValueAcquiredCostMethod us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false true -1238500000 -1238.5 true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false true -1238500000 -1238.5 false false No definition available. No authoritative reference available. false 30 Treasury stock acquired, shares 4 us-gaap_TreasuryStockSharesAcquired us-gaap true na duration shares No definition available. false false false false false false false false false 1 false false 0 0 true false 2 false true 27293000 27293 [3] true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. No authoritative reference available. true 31 Shares balances at Dec. 26, 2009 4 us-gaap_SharesIssued us-gaap true na instant shares No definition available. false false false true false false false true false 1 false true 660847000 660847 [3] true false 2 false true 186354000 186354 [3] true false 3 false false 0 0 true false 4 false false 0 0 true false 5 false false 0 0 true false 6 false false 0 0 false false No definition available. No authoritative reference available. false 32 Balances, value at Dec. 26, 2009 4 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap true credit instant monetary No definition available. false false false true false false false true false 1 true true 6600000 6.6 [3] true false 2 true true -6941500000 -6941.5 true false 3 true true -44200000 -44.2 true false 4 true true 8156700000 8156.7 [3] true false 5 true true 5209600000 5209.6 true false 6 true true 6387200000 6387.2 false false No definition available. No authoritative reference available. false 1 See Note 2, "Summary of Significant Accounting Policies-Income Taxes," for more information. 2 See Note 2, "Summary of Significant Accounting Policies-Other Comprehensive Income and Accumulated Other Comprehensive Income," for more information. 3 Share data, common stock and additional paid-in-capital have been retrospectively adjusted to reflect the January 24, 2008 two-for-one stock split. See Note 1, "Background and Basis of Presentation," for more information. false 6 64 false HundredThousands Thousands UnKnown false true