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Derivative Financial Instruments - (Details) € in Thousands, £ in Thousands, SGD in Thousands, CAD in Thousands, AUD in Thousands, $ in Thousands | Apr. 29, 2017 USD ($) | Apr. 29, 2017 CAD | Apr. 29, 2017 EUR (€) | Apr. 29, 2017 AUD | Apr. 29, 2017 SGD | Apr. 29, 2017 GBP (£) | Apr. 30, 2016 USD ($) | Apr. 30, 2016 CAD | Apr. 30, 2016 EUR (€) | Apr. 30, 2016 AUD | Apr. 30, 2016 SGD | Apr. 30, 2016 GBP (£)
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Recurring Basis |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency contract, asset | $ 64 |  |  |  |  |  |  |  |  |  |  |
Foreign currency contract, liability | (277) |  |  |  |  |  | $ (453) |  |  |  |  |
Recurring Basis | Level 2 |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency contract, asset | 64 |  |  |  |  |  |  |  |  |  |  |
Foreign currency contract, liability | (277) |  |  |  |  |  | (453) |  |  |  |  |
U.S. Dollars/Australian Dollars | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | 7,984 |  |  | AUD 10,669 |  |  | 7,216 |  |  | AUD 10,027 |  |
U.S. Dollars/Canadian Dollars | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | 256 | CAD 345 |  |  |  |  | 563 | CAD 771 |  |  |  |
U.S. Dollars/British Pounds | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | 4,936 |  |  |  |  | £ 3,959 | 1,795 |  |  |  |  | £ 1,263
U.S. Dollars/Singapore Dollars | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | 605 |  |  |  | SGD 844 |  | 261 |  |  |  | SGD 356 |
U.S. Dollars/Euros | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | $ 528 |  | € 491 |  |  |  | $ 147 |  | € 132 |  |  |

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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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- Definition Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps. + References No definition available. + Details
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