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Financial Instruments - Outstanding Currency, Forward Exchange Contracts (Detail) $ in Thousands | Apr. 30, 2017 USD ($)
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Derivative [Line Items] |
Fair Market Value of foreign currency derivative contracts | $ (1,940)
Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 458,941
Fair Market Value of foreign currency derivative contracts | 465,739
Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 511,145
Fair Market Value of foreign currency derivative contracts | 516,038
Euro [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 275,187
Fair Market Value of foreign currency derivative contracts | 280,481
Euro [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 187,639
Fair Market Value of foreign currency derivative contracts | 190,989
British Pound [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 78,912
Fair Market Value of foreign currency derivative contracts | 80,911
British Pound [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 86,330
Fair Market Value of foreign currency derivative contracts | 88,540
Japanese Yen [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 30,912
Fair Market Value of foreign currency derivative contracts | 30,611
Japanese Yen [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 21,082
Fair Market Value of foreign currency derivative contracts | 21,023
Australian Dollar [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 420
Fair Market Value of foreign currency derivative contracts | 412
Australian Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 7,742
Fair Market Value of foreign currency derivative contracts | 7,589
Hong Kong Dollar [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 70,321
Fair Market Value of foreign currency derivative contracts | 70,105
Hong Kong Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 156,706
Fair Market Value of foreign currency derivative contracts | 156,231
Singapore Dollar [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 1,154
Fair Market Value of foreign currency derivative contracts | 1,170
Singapore Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 11,821
Fair Market Value of foreign currency derivative contracts | 11,969
Others [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 2,035
Fair Market Value of foreign currency derivative contracts | 2,049
Others [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 39,825
Fair Market Value of foreign currency derivative contracts | $ 39,697

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