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Derivative Financial Instruments - (Details) € in Thousands, £ in Thousands, SFr in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands | Apr. 28, 2018 USD ($) | Apr. 28, 2018 CAD ($) | Apr. 28, 2018 AUD ($) | Apr. 28, 2018 CHF (SFr) | Apr. 28, 2018 EUR (€) | Apr. 28, 2018 SGD ($) | Apr. 28, 2018 GBP (£) | Apr. 29, 2017 USD ($) | Apr. 29, 2017 CAD ($) | Apr. 29, 2017 AUD ($) | Apr. 29, 2017 CHF (SFr) | Apr. 29, 2017 EUR (€) | Apr. 29, 2017 SGD ($) | Apr. 29, 2017 GBP (£)
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Recurring Basis |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency contract, asset | $ 41 |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency contract, liability | (236) |  |  |  |  |  |  | $ (277) |  |  |  |  |  |
Recurring Basis | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency contract, asset | 41 |  |  |  |  |  |  | 64 |  |  |  |  |  |
Foreign currency contract, liability | (236) |  |  |  |  |  |  | (277) |  |  |  |  |  |
U.S. Dollars/Australian Dollars | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | 1,081 |  | $ 1,400 |  |  |  |  | 7,984 |  | $ 10,669 |  |  |  |
U.S. Dollars/Canadian Dollars | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | 2,165 | $ 2,819 |  |  |  |  |  | 256 | $ 345 |  |  |  |  |
U.S. Dollars/British Pounds | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | 5,856 |  |  |  |  |  | £ 4,368 | 4,936 |  |  |  |  |  | £ 3,959
U.S. Dollars/Singapore Dollars | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | 236 |  |  |  |  | $ 312 |  | 605 |  |  |  |  | $ 844 |
U.S. Dollars/Euros | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | 854 |  |  |  | € 708 |  |  | 528 |  |  |  | € 491 |  |
U.S. Dollars/Swiss Franc | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | $ 41 |  |  | SFr 40 |  |  |  | $ 0 |  |  | SFr 0 |  |  |

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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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