Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity - Stock Option Awards - Grant Volatility (Details)

v3.7.0.1
Shareholders' Equity - Stock Option Awards - Grant Volatility (Details) - Stock Options [Member]
12 Months Ended
Jan. 28, 2017
Jan. 30, 2016
Jan. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected Volatility Rate, Minimum 81.00% 75.00% 88.00%
Expected Volatility Rate, Maximum 84.00% 82.00% 98.00%
Expected Term 6 years 6 years  
Risk Free Interest Rate, Minimum 1.40% 1.70% 1.50%
Risk Free Interest Rate, Maximum 2.20% 1.90% 2.20%
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected Term     5 years
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected Term     6 years