Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 29, 2016	Oct. 31, 2015	Oct. 29, 2016	Oct. 31, 2015
Income Tax Disclosure [Abstract]
Effective income tax rate	22.60%	38.60%	30.30%	43.80%
Effective income tax rate reconciliation, tax settlement	$ 1.6		$ 1.6