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Derivative Financial Instruments (Details) € in Thousands, £ in Thousands, SGD in Thousands, PLN in Thousands, CAD in Thousands, AUD in Thousands, $ in Thousands | Jan. 28, 2017 CAD | Jan. 28, 2017 AUD | Jan. 28, 2017 PLN | Jan. 28, 2017 USD ($) | Jan. 28, 2017 EUR (€) | Jan. 28, 2017 SGD | Jan. 28, 2017 GBP (£) | Apr. 30, 2016 CAD | Apr. 30, 2016 AUD | Apr. 30, 2016 PLN | Apr. 30, 2016 USD ($) | Apr. 30, 2016 EUR (€) | Apr. 30, 2016 SGD | Apr. 30, 2016 GBP (£)
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U.S. Dollars/Australian Dollars |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: |  | AUD 9,062 |  | $ 6,734 |  |  |  |  | AUD 10,027 |  | $ 7,216 |  |  |
U.S. Dollars/Japanese Yen |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: |  |  | PLN 22,345 | 198 |  |  |  |  |  | PLN 0 | 0 |  |  |
U.S. Dollars/Canadian Dollars |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | CAD 740 |  |  | 557 |  |  |  | CAD 771 |  |  | 563 |  |  |
U.S. Dollars/British Pounds |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: |  |  |  | 4,836 |  |  | £ 3,866 |  |  |  | 1,795 |  |  | £ 1,263
U.S. Dollars/Singapore Dollars |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: |  |  |  | 581 |  | SGD 844 |  |  |  |  | 261 |  | SGD 356 |
U.S. Dollars/Euros |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: |  |  |  | $ 1,621 | € 1,510 |  |  |  |  |  | $ 147 | € 132 |  |

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