Financial Instruments - Additional Information (Detail)	6 Months Ended
Jul. 29, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Hedge of diesel fuel requirement, remainder of fiscal year 2018	53.00%
Hedge of diesel fuel requirement, fiscal year 2019	46.00%

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.

No definition available.

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