Other Assets - Components of Other Assets (Detail) - USD ($) $ in Millions	Jan. 30, 2016	Jan. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred extended service plan selling costs	$ 79.4	$ 69.7
Investments	26.8	25.2
Other assets	56.1	45.1
Total other assets	162.3	140.0
Deferred costs related to the sale of the extended service plan	$ 26.4	$ 24.9