Share-Based Compensation (Restricted Stock Units Activity) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |
Oct. 28, 2017 | Oct. 29, 2016 | Oct. 28, 2017 | Oct. 29, 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 | | $ 0.2 | $ 0.2 | $ 2.7 | $ 6.6 |
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 October 28, 2017 | | 730,736 | | 730,736 | |
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 | | | | 1,673,528 | |
Number of Underlying Shares, Adjustments for performance achievement | | | | 0 | |
Number of Underlying Shares, Vested | | | | (676,345) | |
Number of Underlying Shares, Forfeited | | | | (293,668) | |
Number of Underlying Shares, Ending Balance at October 28, 2017 | [1] | 2,618,976 | | 2,618,976 | |
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 | | | | 9.89 | |
Weighted-Average Grant Date Fair Value, Adjustments for performance achievement | | | | 0 | |
Weighted-Average Grant Date Fair Value, Vested | | | | 25.92 | |
Weighted-Average Grant Date Fair Value, Forfeited | | | | 23 | |
Weighted-Average Grant Date Fair Value, Ending Balance at October 28, 2017 | | $ 15.61 | | $ 15.61 | |
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 October 28, 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 October 28, 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 October 28, 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 | $ 31.01 |
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 October 28, 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) Includes 730,736 unvested restricted stock units as of October 28, 2017 which are subject to the vesting requirement that the Company must achieve at least $1.00 of GAAP net income attributable to A&F for the fiscal year immediately preceding the vesting date. | |