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Shareholders' Equity - Summary of Service-Based Restricted Stock Awards and Units Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Oct. 31, 2015
Nov. 01, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Fair value of awards vested $ 0.2 $ 0.3
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Shares Outstanding at January 31, 2015 150,000  
Granted, Shares 125,000  
Vested, Shares (150,000)  
Outstanding at October 31, 2015 125,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Weighted-Average Grant-Date Fair Value, Outstanding at January 31, 2015 (in dollars per share) $ 2.25  
Weighted-Average Grant-Date Fair Value, Granted (in dollars per share) 1.42 $ 2.25
Weighted-Average Grant-Date Fair Value Vested (in dollars per share) 2.25  
Weighted-Average Grant-Date Fair Value, Outstanding at May 2, 2015 (in dollars per share) $ 1.42  
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Shares Outstanding at January 31, 2015 964,001  
Granted, Shares 3,850,000  
Vested, Shares (369,079)  
Forfeited or expired, Shares (156,353)  
Outstanding at October 31, 2015 4,288,569  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Weighted-Average Grant-Date Fair Value, Outstanding at January 31, 2015 (in dollars per share) $ 1.99  
Weighted-Average Grant-Date Fair Value, Granted (in dollars per share) 2.12 $ 2.51
Weighted-Average Grant-Date Fair Value Vested (in dollars per share) 2.16  
Weighted-Average Grant-Date Fair Value, Forfeited (in dollars per share) 2.20  
Weighted-Average Grant-Date Fair Value, Outstanding at May 2, 2015 (in dollars per share) $ 2.08  
Fair value of awards vested $ 1.0 $ 1.2