Share-Based Compensation (Restricted Stock Units Activity) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |
Jul. 29, 2017 | Jul. 30, 2016 | Jul. 29, 2017 | Jul. 30, 2016 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | |
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options | | $ 0.5 | $ 1.5 | $ 2.5 | $ 6.4 |
Target percentage of equity awards earned | | | | 100.00% | |
Service-based restricted stock units with $1.00 net income requirement [Member] | | | | | |
Restricted Stock Unit Activity, Number of Underlying Shares | | | | | |
Number of Underlying Shares, Ending Balance at July 29, 2017 | | 724,440 | | 724,440 | |
Service-based restricted stock units | | | | | |
Restricted Stock Unit Activity, Number of Underlying Shares | | | | | |
Number of Underlying Shares, Beginning Balance at January 28, 2017 | | | | 1,915,461 | |
Number of Underlying Shares, Granted | | | | 1,617,440 | |
Number of Underlying Shares, Adjustments for performance achievement | | | | 0 | |
Number of Underlying Shares, Vested | | | | (639,503) | |
Number of Underlying Shares, Forfeited | | | | (230,744) | |
Number of Underlying Shares, Ending Balance at July 29, 2017 | [1] | 2,662,654 | | 2,662,654 | |
Restricted Stock Unit Activity, Weighted-Average Grant Date Fair Value | | | | | |
Weighted-Average Grant Date Fair Value, Beginning Balance at January 28, 2017 | | | | $ 25.47 | |
Weighted-Average Grant Date Fair Value, Granted | | | | 9.86 | |
Weighted-Average Grant Date Fair Value, Adjustments for performance achievement | | | | 0 | |
Weighted-Average Grant Date Fair Value, Vested | | | | 26.28 | |
Weighted-Average Grant Date Fair Value, Forfeited | | | | 23.15 | |
Weighted-Average Grant Date Fair Value, Ending Balance at July 29, 2017 | | $ 15.93 | | $ 15.93 | |
Performance-based restricted stock units [Member] | | | | | |
Restricted Stock Unit Activity, Number of Underlying Shares | | | | | |
Number of Underlying Shares, Beginning Balance at January 28, 2017 | | | | 203,923 | |
Number of Underlying Shares, Granted | | | | 524,030 | |
Number of Underlying Shares, Adjustments for performance achievement | | | | 0 | |
Number of Underlying Shares, Vested | | | | 0 | |
Number of Underlying Shares, Forfeited | | | | (37,779) | |
Number of Underlying Shares, Ending Balance at July 29, 2017 | | 690,174 | | 690,174 | |
Restricted Stock Unit Activity, Weighted-Average Grant Date Fair Value | | | | | |
Weighted-Average Grant Date Fair Value, Beginning Balance at January 28, 2017 | | | | $ 22.53 | |
Weighted-Average Grant Date Fair Value, Granted | | | | 9.11 | |
Weighted-Average Grant Date Fair Value, Adjustments for performance achievement | | | | 0 | |
Weighted-Average Grant Date Fair Value, Vested | | | | 0 | |
Weighted-Average Grant Date Fair Value, Forfeited | | | | 21.75 | |
Weighted-Average Grant Date Fair Value, Ending Balance at July 29, 2017 | | $ 11.82 | | $ 11.82 | |
Market-based restricted stock units [Member] | | | | | |
Restricted Stock Unit Activity, Number of Underlying Shares | | | | | |
Number of Underlying Shares, Beginning Balance at January 28, 2017 | | | | 184,892 | |
Number of Underlying Shares, Granted | | | | 236,872 | |
Number of Underlying Shares, Adjustments for performance achievement | | | | 0 | |
Number of Underlying Shares, Vested | | | | 0 | |
Number of Underlying Shares, Forfeited | | | | (37,784) | |
Number of Underlying Shares, Ending Balance at July 29, 2017 | | 383,980 | | 383,980 | |
Restricted Stock Unit Activity, Weighted-Average Grant Date Fair Value | | | | | |
Weighted-Average Grant Date Fair Value, Beginning Balance at January 28, 2017 | | | | $ 26.89 | |
Weighted-Average Grant Date Fair Value, Granted | | | | 11.79 | $ 34.12 |
Weighted-Average Grant Date Fair Value, Adjustments for performance achievement | | | | 0 | |
Weighted-Average Grant Date Fair Value, Vested | | | | 0 | |
Weighted-Average Grant Date Fair Value, Forfeited | | | | 26.14 | |
Weighted-Average Grant Date Fair Value, Ending Balance at July 29, 2017 | | $ 16.50 | | $ 16.50 | |
Minimum | Performance-based restricted stock units [Member] | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | |
Target percentage of equity awards earned | | | | 0.00% | |
Minimum | Market-based restricted stock units [Member] | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | |
Target percentage of equity awards earned | | | | 0.00% | |
Maximum | Performance-based restricted stock units [Member] | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | |
Target percentage of equity awards earned | | | | 200.00% | |
Maximum | Market-based restricted stock units [Member] | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | |
Target percentage of equity awards earned | | | | 200.00% | |
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[1] | (1) This includes 724,440 unvested restricted stock units as of July 29, 2017 that are subject to the requirement that the Company must achieve at least $1.00 of GAAP net income attributable to A&F for the fiscal year in order to vest. | |