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Organization and Summary of Significant Accounting Policies (Percentage of Sales by Merchandise Category) (Details) | 12 Months Ended
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Feb. 03, 2018 | Jan. 28, 2017 | Jan. 30, 2016
Percentage of sales from Merchandise Categories | 100.00% | 100.00% | 100.00%
Women's Accessories, Intimate Apparel, Shoes and Cosmetics [Member] |  |  |
Percentage of sales from Merchandise Categories | 38.00% | 38.00% | 38.00%
Women's Apparel [Member] |  |  |
Percentage of sales from Merchandise Categories | 23.00% | 23.00% | 23.00%
Men's and Children's [Member] |  |  |
Percentage of sales from Merchandise Categories | 23.00% | 23.00% | 23.00%
Home/Miscellaneous [Member] |  |  |
Percentage of sales from Merchandise Categories | 16.00% | 16.00% | 16.00%

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- Definition Percentage of Sales From Merchandise Categories provided on an enterprise wide basis + References No definition available. + Details
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Namespace Prefix: | m_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | na
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- Details
Name: | us-gaap_ProductOrServiceAxis=m_WomensApparelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ProductOrServiceAxis=m_MensAndChildrensMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ProductOrServiceAxis=m_HomeAndMiscellaneousMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |