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Derivative Financial Instruments (Details) € in Thousands, £ in Thousands, SGD in Thousands, CAD in Thousands, AUD in Thousands, $ in Thousands | Jul. 29, 2017 CAD | Jul. 29, 2017 AUD | Jul. 29, 2017 USD ($) | Jul. 29, 2017 EUR (€) | Jul. 29, 2017 SGD | Jul. 29, 2017 GBP (£) | Apr. 29, 2017 CAD | Apr. 29, 2017 AUD | Apr. 29, 2017 USD ($) | 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 4,842 | $ 3,632 |  |  |  |  | AUD 10,669 | $ 7,984 |  |  |
U.S. Dollars/Canadian Dollars |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | CAD 1,319 |  | 998 |  |  |  | CAD 345 |  | 256 |  |  |
U.S. Dollars/British Pounds |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: |  |  | 3,283 |  |  | £ 2,633 |  |  | 4,936 |  |  | £ 3,959
U.S. Dollars/Singapore Dollars |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: |  |  | 0 |  | SGD 0 |  |  |  | 605 |  | SGD 844 |
U.S. Dollars/Euros |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: |  |  | 1,688 | € 1,498 |  |  |  |  | 528 | € 491 |  |
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 2 |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |
Derivatives - currency forward contract, asset |  |  | 31 |  |  |  |  |  | 64 |  |  |
Derivatives - currency forward contracts, liability |  |  | $ 602 |  |  |  |  |  | $ 277 |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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