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Income Taxes - Projected Effective Tax Rate for Periods (Detail)
3 Months Ended 6 Months Ended
Jul. 29, 2017
Jul. 30, 2016
Jul. 29, 2017
Jul. 30, 2016
Income Tax Disclosure [Abstract]        
Effective tax rates for income from continuing operations 24.10% 27.70% 23.40% 29.60%