v3.7.0.1
Computation of Net Income (Loss) Per Common Share - Reconciliation of Common Shares Used in Calculating Basic and Diluted Net Income (Loss) Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jul. 29, 2017
Jul. 30, 2016
Jul. 29, 2017
Jul. 30, 2016
Equity [Abstract]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 2.1 1.4 2.1 1.3
Net income $ 22.2 $ 27.9 $ 81.2 $ 93.7
Basic weighted average common shares outstanding 101.4 104.0 101.3 103.9
Dilutive effect of stock options and restricted stock awards 0.1 0.3 0.1 0.3
Diluted weighted average common shares outstanding 101.5 104.3 101.4 104.2
Net income (loss) per common share:        
Earnings Per Share, Basic $ 0.22 $ 0.27 $ 0.80 $ 0.90
Earnings Per Share, Diluted $ 0.22 $ 0.27 $ 0.80 $ 0.90