XML 42 R45.htm IDEA: XBRL DOCUMENT v3.3.0.814
Income Taxes (Details) - USD ($)
$ in Millions
9 Months Ended
Oct. 31, 2015
Nov. 01, 2014
Jan. 31, 2015
Income Tax Disclosure [Abstract]      
Effective income tax rate (as a percent) 38.00% 34.00%  
Aggregate accruals for uncertain tax positions, including penalties and interest $ 13.9   $ 14.4