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Derivative Financial Instruments - (Details) € in Thousands, ¥ in Thousands, £ in Thousands, SGD in Thousands, SFr in Thousands, CAD in Thousands, AUD in Thousands, $ in Thousands | Apr. 30, 2016 USD ($) | Apr. 30, 2016 CAD | Apr. 30, 2016 AUD | Apr. 30, 2016 CHF (SFr) | Apr. 30, 2016 JPY (¥) | Apr. 30, 2016 EUR (€) | Apr. 30, 2016 SGD | Apr. 30, 2016 GBP (£) | May 02, 2015 USD ($) | May 02, 2015 CAD | May 02, 2015 AUD | May 02, 2015 CHF (SFr) | May 02, 2015 JPY (¥) | May 02, 2015 EUR (€) | May 02, 2015 SGD | May 02, 2015 GBP (£)
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Recurring Basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of foreign currency exchange forward contracts | $ (453) |  |  |  |  |  |  |  | $ (283) |  |  |  |  |  |  |
Recurring Basis | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of foreign currency exchange forward contracts | (453) |  |  |  |  |  |  |  | (283) |  |  |  |  |  |  |
U.S. Dollars/Australian Dollars | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | 7,216 |  | AUD 10,027 |  |  |  |  |  | 1,487 |  | AUD 1,918 |  |  |  |  |
U.S. Dollars/Canadian Dollars | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | 563 | CAD 771 |  |  |  |  |  |  | 4,129 | CAD 4,923 |  |  |  |  |  |
U.S. Dollars/British Pounds | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | 1,795 |  |  |  |  |  |  | £ 1,263 | 1,679 |  |  |  |  |  |  | £ 1,123
U.S. Dollars/Singapore Dollars | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | 261 |  |  |  |  |  | SGD 356 |  | 1,176 |  |  |  |  |  | SGD 1,601 |
U.S. Dollars/Euros | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | 147 |  |  |  |  | € 132 |  |  | (229) |  |  |  |  | € 174 |  |
U.S. Dollars/Swiss Franc | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | 0 |  |  | SFr 0 |  |  |  |  | 5,662 |  |  | SFr 5,500 |  |  |  |
U.S. Dollars/Japanese Yen | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | $ 0 |  |  |  | ¥ 0 |  |  |  | $ 764 |  |  |  | ¥ 91,282 |  |  |

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