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Derivative Financial Instruments (Details) € in Thousands, £ in Thousands, SGD in Thousands, CAD in Thousands, AUD in Thousands, $ in Thousands | Jul. 30, 2016 CAD | Jul. 30, 2016 AUD | Jul. 30, 2016 USD ($) | Jul. 30, 2016 EUR (€) | Jul. 30, 2016 SGD | Jul. 30, 2016 GBP (£) | Apr. 30, 2016 CAD | Apr. 30, 2016 AUD | Apr. 30, 2016 USD ($) | Apr. 30, 2016 EUR (€) | Apr. 30, 2016 SGD | Apr. 30, 2016 GBP (£)
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U.S. Dollars/Australian Dollars |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: |  | AUD 13,576 | $ 10,025 |  |  |  |  | AUD 10,027 | $ 7,216 |  |  |
U.S. Dollars/Canadian Dollars |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: | CAD 1,159 |  | 878 |  |  |  | CAD 771 |  | 563 |  |  |
U.S. Dollars/British Pounds |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: |  |  | 4,559 |  |  | £ 3,155 |  |  | 1,795 |  |  | £ 1,263
U.S. Dollars/Singapore Dollars |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: |  |  | 748 |  | SGD 1,022 |  |  |  | 261 |  | SGD 356 |
U.S. Dollars/Euros |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Exchange Forward Contracts: |  |  | $ 2,878 | € 2,555 |  |  |  |  | $ 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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