Income Taxes - Projected Effective Tax Rate for Periods (Detail)	3 Months Ended		9 Months Ended
	Oct. 28, 2017	Oct. 29, 2016	Oct. 28, 2017	Oct. 29, 2016
Income Tax Disclosure [Abstract]
Effective tax rates for income from continuing operations	12.40%	35.10%	17.90%	31.50%