Represents the number of weeks the entity reports its half year results of operations based on.

No definition available.

Name:	mik_NumberOfWeeksInFiscalHalfYear
Namespace Prefix:	mik_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the number of weeks the entity reports its quarterly results of operations based on.

No definition available.

Name:	mik_NumberOfWeeksInFiscalQuarters
Namespace Prefix:	mik_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the number of weeks the entity reports its annual results of operations based on.

No definition available.

Name:	mik_NumberOfWeeksInFiscalYear
Namespace Prefix:	mik_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the maximum number of weeks the entity reports its annual results of operations based on.

No definition available.

Name:	mik_NumberOfWeeksInFiscalYearMaximum
Namespace Prefix:	mik_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the minimum number of weeks the entity reports its annual results of operations based on.

No definition available.

Name:	mik_NumberOfWeeksInFiscalYearMinimum
Namespace Prefix:	mik_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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

Summary of Significant Accounting Policies (Details)	3 Months Ended		6 Months Ended		12 Months Ended
Summary of Significant Accounting Policies (Details)	Jul. 28, 2012 week	Jul. 30, 2011 week	Jul. 28, 2012 week	Jul. 30, 2011 week	Jan. 28, 2012 week
Summary of Significant Accounting Policies
Minimum number of weeks in a fiscal year			52
Maximum number of weeks in a fiscal year			53
Number of weeks in a fiscal year			53		52
Number of weeks in a fiscal quarter	13	13
Number of weeks in a fiscal half year			26	26