Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
Apr. 29, 2016	Apr. 28, 2017	Jan. 27, 2017
Income Tax Examination [Line Items]
Unrecognized tax benefits		$ 6.9
Unrecognized tax benefits, if recognized, would impact effective tax rate		4.5
Amount of interest and penalties recognized		5.1
Amount of interest and penalties recognized, net of federal benefit		3.3
Tax Adjustments, Settlements, and Unusual Provisions	$ 1.2
Sears Holdings Corporation \| Other assets
Income Tax Examination [Line Items]
Indemnification receivable, uncertain tax positions	$ 13.9	$ 11.6	$ 11.4

Income Tax Examination, Penalties and Interest Accrued, Net of Federal Tax Benefit

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Indemnification Asset, Uncertain Tax Positions

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 25
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28446-109314

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 740
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Amount of unrecognized tax benefits.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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