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Derivative Financial Instruments (Details) € in Thousands, £ in Thousands, SGD in Thousands, SFr in Thousands, CAD in Thousands, AUD in Thousands, $ in Thousands | Jan. 27, 2018 CAD | Jan. 27, 2018 AUD | Jan. 27, 2018 CHF (SFr) | Jan. 27, 2018 USD ($) | Jan. 27, 2018 EUR (€) | Jan. 27, 2018 SGD | Jan. 27, 2018 GBP (£) | Apr. 29, 2017 CAD | Apr. 29, 2017 AUD | Apr. 29, 2017 CHF (SFr) | Apr. 29, 2017 USD ($) | Apr. 29, 2017 EUR (€) | Apr. 29, 2017 SGD | Apr. 29, 2017 GBP (£)
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U.S. Dollars/Australian Dollars |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: |  | AUD 3,408 |  | $ 2,615 |  |  |  |  | AUD 10,669 |  | $ 7,984 |  |  |
U.S. Dollars/Canadian Dollars |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | CAD 1,864 |  |  | 1,424 |  |  |  | CAD 345 |  |  | 256 |  |  |
U.S. Dollars/British Pounds |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: |  |  |  | 6,402 |  |  | £ 4,778 |  |  |  | 4,936 |  |  | £ 3,959
U.S. Dollars/Singapore Dollars |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: |  |  |  | 237 |  | SGD 312 |  |  |  |  | 605 |  | SGD 844 |
U.S. Dollars/Euros |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: |  |  |  |  |  |  |  |  |  |  | 528 | € 491 |  |
U.S. Dollars/Swiss Franc |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: |  |  | SFr 989 | 998 |  |  |  |  |  | SFr 0 | 0 |  |  |
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives - currency forward contract, asset |  |  |  | 64 |  |  |  |  |  |  | 64 |  |  |
Derivatives - currency forward contracts, liability |  |  |  | 720 |  |  |  |  |  |  | $ 277 |  |  |
Short [Member] | U.S. Dollars/Euros |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: |  |  |  | $ 1,277 | € 1,061 |  |  |  |  |  |  |  |  |

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