Concentration of Credit Risk (Details) (USD $)	12 Months Ended
Jan. 28, 2012
Concentration risk
Percentage of increase or decrease in interest rates affecting income before income taxes	1.00%
Amount of effect of one percent increase or decrease in interest rates on income before income taxes	$ 20,000,000
Percentage of increase or decrease in interest rates affecting fair value of long-term fixed rate debt	1.00%
Amount of effect of one percent increase or decrease in interest rates on fair value of long-term fixed rate debt	26,000,000
Minimum [Member]
Concentration risk
Balance deposited with federally-insured financial institutions	250,000
Maximum [Member]
Concentration risk
Aggregate account balance is subjected to be insured by the Federal Deposit Insurance Corporation	$ 250,000
Maturity of short-term interest bearing securities to be considered as cash and cash equivalents	90 days

Aggregate account balance is subjected to be insured by the Federal Deposit Insurance Corporation.

No definition available.

Name:	mik_AggregateAccountBalanceInsuredByFDIC
Namespace Prefix:	mik_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

Represents the amount of effect of one percent increase or decrease in interest rate on fair value of long-term fixed rate debt.

No definition available.

Name:	mik_EffectOfOnePercentIncreaseOrDecreaseInFixedInterestRatesOnFairValueOfLongTermFixedRateDebt
Namespace Prefix:	mik_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the amount of effect of one percent increase or decrease in interest rate on income before income taxes.

No definition available.

Name:	mik_EffectOfOnePercentIncreaseOrDecreaseInVariableDebtInterestRatesOnIncomeBeforeIncomeTaxes
Namespace Prefix:	mik_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Original maturity of short-term interest bearing securities to be considered as cash and cash equivalents.

No definition available.

Name:	mik_MaturityOfShortTermInterestBearingSecuritiesToBeConsideredAsCashAndCashEquivalents
Namespace Prefix:	mik_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the percentage of increase or decrease in interest rates affecting fair value of long-term fixed rate debt.

No definition available.

Name:	mik_PercentageOfIncreaseOrDecreaseInFixedInterestRatesAffectingFairValueOfLongTermFixedRateDebt
Namespace Prefix:	mik_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the percentage of increase or decrease in interest rates affecting income before income taxes.

No definition available.

Name:	mik_PercentageOfIncreaseOrDecreaseInVariableDebtInterestRatesAffectingIncomeBeforeIncomeTaxes
Namespace Prefix:	mik_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

No definition available.

Name:	us-gaap_CashFDICInsuredAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Name:	us-gaap_ConcentrationRiskLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration